{
  "schema": "canli.company-reference.v1",
  "cik": "0001196501",
  "name": "HMS HOLDINGS CORP.",
  "selection_policy": "extended-v23",
  "source_url": "https://data.sec.gov/api/xbrl/companyfacts/CIK0001196501.json",
  "source_sha256": "39968238712b97d6deff48f1f50f04080309d1d71d76f19a8e2acf8045a74775",
  "fetched_at": "2026-09-22T19:42:51.739Z",
  "policy": "Latest-filed annual-report facts per unit and reporting period at capture time. Duration facts cover 300 to 400 days. This selection can include restatements and is not a point-in-time backtest dataset. Missing concepts are omitted, never zero-filled. Values retain original units and are not currency converted. Extended concepts require compatible unit shapes and at least three reporting ends with changing values within one unit. Constant or incompatible added histories are omitted.",
  "claim_boundary": "Public company accounting reference, not market prices, returns, an investment recommendation, or ALPHAC performance. Validate a separately constructed return series with the validation API; accounting values are not returns.",
  "concepts": [
    {
      "tag": "Assets",
      "taxonomy": "us-gaap",
      "label": "Total assets",
      "kind": "instant",
      "meaning": "Resources recognized on the balance sheet. Book assets are not the market value of the business.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 1329677000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 1244276000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 1078518000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 975160000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 882755000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 850597000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 880988000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 878602000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 929702000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 869331000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 352905000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 270644000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "Liabilities",
      "taxonomy": "us-gaap",
      "label": "Total liabilities",
      "kind": "instant",
      "meaning": "Recognized obligations at the reporting date. The definition and scope differ from interest-bearing debt.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 381348000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 389411000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 365122000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 368931000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 326145000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 325895000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 347898000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 376163000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 466828000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 478094000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 45267000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 32351000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "StockholdersEquity",
      "taxonomy": "us-gaap",
      "label": "Stockholders equity",
      "kind": "instant",
      "meaning": "The reported residual interest after liabilities. It is an accounting amount, not market capitalization.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 948329000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 854865000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 713396000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 606229000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 556610000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 524702000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 533090000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 502439000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 462874000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 391237000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 307638000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 238293000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        },
        {
          "end": "2008-12-31",
          "val": 178362000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2008Q4I",
          "unit": "USD"
        },
        {
          "end": "2007-12-31",
          "val": 138749000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2007Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "CashAndCashEquivalentsAtCarryingValue",
      "taxonomy": "us-gaap",
      "label": "Cash and cash equivalents",
      "kind": "instant",
      "meaning": "Cash and qualifying short-term liquid investments under the filer’s accounting policy. Restricted cash and longer-term investments may be reported separately.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 207124000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 139268000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 178946000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 83313000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 175999000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 145610000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 133116000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 93366000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 135227000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 97003000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 94836000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 64863000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        },
        {
          "end": "2008-12-31",
          "val": 49216000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2008Q4I",
          "unit": "USD"
        },
        {
          "end": "2007-12-31",
          "val": 21275000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2007Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NetIncomeLoss",
      "taxonomy": "us-gaap",
      "label": "Net income or loss",
      "kind": "duration",
      "meaning": "Reported profit or loss for the period. Check the filing for attribution, exceptional items and discontinued operations before comparing companies.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 70149000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 87224000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 54989000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 40054000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 37636000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 24527000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 13947000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 39997000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 50516000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 40092000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 30048000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 21375000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NetCashProvidedByUsedInOperatingActivities",
      "taxonomy": "us-gaap",
      "label": "Operating cash flow",
      "kind": "duration",
      "meaning": "Cash generated or used by operating activities. Working-capital timing can make this differ substantially from reported income.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 99048000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 133232000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 96457000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 86464000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 88639000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 72285000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 61925000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 32842000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 30869000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "PaymentsToAcquirePropertyPlantAndEquipment",
      "taxonomy": "us-gaap",
      "label": "Capital expenditure payments",
      "kind": "duration",
      "meaning": "Cash payments to acquire property, plant and equipment. This taxonomy concept does not capture every form of investment or acquisition.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 11253000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 8276000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 11264000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 17318000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 13703000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 8620000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 22687000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 22127000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 25222000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 18477000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 15603000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 8979000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 5988000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "RevenueFromContractWithCustomerExcludingAssessedTax",
      "taxonomy": "us-gaap",
      "label": "Contract revenue excluding tax",
      "kind": "duration",
      "meaning": "Revenue from customer contracts excluding assessed taxes under this specific taxonomy concept. It is not automatically comparable to older revenue tags.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 673283000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 626395000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 598290000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 521212000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NetCashProvidedByUsedInFinancingActivities",
      "taxonomy": "us-gaap",
      "label": "Financing cash flow",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Net cash from financing activities, including borrowing, repayments and transactions with owners. A positive amount does not establish operating profitability.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": -1444000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 32149000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 29589000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 25214000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -19049000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -47974000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 21709000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 5965000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 8468000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NetCashProvidedByUsedInInvestingActivities",
      "taxonomy": "us-gaap",
      "label": "Investing cash flow",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Net cash from investing activities, including asset purchases, disposals and investment transactions. This differs from capital expenditure payments alone.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": -29748000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": -205059000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": -30413000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": -204364000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -39201000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -11817000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -53661000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -23160000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": -11396000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "RetainedEarningsAccumulatedDeficit",
      "taxonomy": "us-gaap",
      "label": "Retained earnings or deficit",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Accumulated undistributed earnings or deficit at the reporting date. This balance is not cash available for distribution.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 579608000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 509459000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 422235000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 366164000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 326110000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 288474000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 263947000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 250000000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 210003000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 159487000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 111702000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 71610000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "WeightedAverageNumberOfSharesOutstandingBasic",
      "taxonomy": "us-gaap",
      "label": "Basic weighted-average shares",
      "kind": "duration",
      "unitKind": "shares",
      "meaning": "Time-weighted shares used for basic earnings per share. This denominator differs from shares outstanding at a single reporting date.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 88438000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "shares"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 87222000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "shares"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 83625000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "shares"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 83821000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "shares"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 84221000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 87881000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 87673000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 87598000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 86204000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "shares"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 84588000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 81762000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "shares"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 78330000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "shares"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 25048000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "shares"
        }
      ]
    },
    {
      "tag": "WeightedAverageNumberOfDilutedSharesOutstanding",
      "taxonomy": "us-gaap",
      "label": "Diluted weighted-average shares",
      "kind": "duration",
      "unitKind": "shares",
      "meaning": "Weighted-average shares used for diluted earnings per share. Potential shares are included under the applicable dilution rules, not simply added to outstanding shares.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 90081000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "shares"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 89317000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "shares"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 86144000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "shares"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 85088000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "shares"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 86987000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 88361000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 88164000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 88344000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 88365000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "shares"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 87444000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 85375000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "shares"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 82862000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "shares"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 26816000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "shares"
        }
      ]
    },
    {
      "tag": "EarningsPerShareBasic",
      "taxonomy": "us-gaap",
      "label": "Basic earnings per share",
      "kind": "duration",
      "unitKind": "per-share",
      "meaning": "Reported earnings or loss per basic common share or unit. Inspect attribution, share classes and restatements before comparing periods. This is not a market return.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 0.79,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD/shares"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 1,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD/shares"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 0.66,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD/shares"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 0.48,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD/shares"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 0.45,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD/shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 0.28,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD/shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 0.16,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD/shares"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 0.46,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD/shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 0.59,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD/shares"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 0.56,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD/shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 0.49,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD/shares"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 0.38,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD/shares"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 0.85,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD/shares"
        }
      ]
    },
    {
      "tag": "EarningsPerShareDiluted",
      "taxonomy": "us-gaap",
      "label": "Diluted earnings per share",
      "kind": "duration",
      "unitKind": "per-share",
      "meaning": "Reported earnings or loss per share under dilution rules. Antidilutive instruments may be excluded. A diluted value can equal the basic value without implying no potential dilution.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 0.78,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD/shares"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 0.98,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD/shares"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 0.64,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD/shares"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 0.47,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD/shares"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 0.43,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD/shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 0.28,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD/shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 0.16,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD/shares"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 0.45,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD/shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 0.57,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD/shares"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 0.55,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD/shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 0.47,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD/shares"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 0.36,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD/shares"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 0.8,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD/shares"
        }
      ]
    },
    {
      "tag": "IncomeTaxExpenseBenefit",
      "taxonomy": "us-gaap",
      "label": "Income tax expense or benefit",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Current and deferred income tax expense or benefit for continuing operations. This accounting expense differs from cash taxes paid.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 17121000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 17138000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": -1972000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": -199000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 11835000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 15282000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 12383000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 25593000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 32829000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 33178000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 26583000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 20966000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 14583000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "PropertyPlantAndEquipmentNet",
      "taxonomy": "us-gaap",
      "label": "Net property, plant and equipment",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Carrying amount of property, plant and equipment after accumulated depreciation, depletion and amortization. It is not replacement cost or market value.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 81539000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 86947000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 94435000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 98581000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 92167000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 96551000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 116027000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 123006000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 129327000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 127177000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 44713000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 20902000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ShareBasedCompensation",
      "taxonomy": "us-gaap",
      "label": "Share-based compensation expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Reported noncash expense for share-based payment arrangements. Noncash treatment does not mean the awards have no economic cost to shareholders.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 24044000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 21901000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 21507000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 24143000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 13277000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 14297000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 13356000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 11997000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 9116000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 8376000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 7544000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 6373000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 3498000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OperatingIncomeLoss",
      "taxonomy": "us-gaap",
      "label": "Operating income or loss",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Operating revenue less operating expenses for the reporting period. It excludes items outside the reported operating result and is not free cash flow.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 93227000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 103016000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 63238000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 50431000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 57669000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 47572000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 34204000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 77178000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 99512000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 80871000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 66744000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 51868000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 36730000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AssetsCurrent",
      "taxonomy": "us-gaap",
      "label": "Current assets",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Assets classified as current under the normal operating cycle or one-year boundary. Not all current assets can be converted immediately into cash.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 499737000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 397410000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 425309000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 292654000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 367635000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 329068000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 317619000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 285315000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 309933000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 237588000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 180048000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 140441000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "InterestExpense",
      "taxonomy": "us-gaap",
      "label": "Interest expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Borrowing costs recognized as interest expense. This is distinct from cash interest paid and may not include every capitalized borrowing cost.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 7586000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 11013000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 11310000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 10871000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 8519000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 7812000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 7931000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 12460000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 16561000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 605000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 94000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 1080000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 1491000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "LiabilitiesCurrent",
      "taxonomy": "us-gaap",
      "label": "Current liabilities",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Obligations classified as current under the operating-cycle or one-year boundary. The balance includes more than short-term borrowing.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 102369000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 101317000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 96625000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 92687000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 90157000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 88612000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 91348000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 86246000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 104233000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 67726000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 32502000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 26474000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "Goodwill",
      "taxonomy": "us-gaap",
      "label": "Goodwill carrying amount",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Recognized goodwill remaining after accumulated impairment. It arises from business combinations and does not measure the current value of the company’s brand.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 594561000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 599351000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 487617000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 487617000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 379716000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 361468000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 361468000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 361468000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 361468000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 361786000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 107414000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 91520000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "FiniteLivedIntangibleAssetsNet",
      "taxonomy": "us-gaap",
      "label": "Net finite-lived intangible assets",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Finite-lived intangible assets after amortization. This excludes goodwill and should not be combined with indefinite-lived intangible assets without checking scope.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 117193000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 131849000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 67140000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 91482000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 37797000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 54308000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 74578000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 95312000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 119119000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 132740000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 19826000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 16798000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AccountsReceivableNetCurrent",
      "taxonomy": "us-gaap",
      "label": "Net current accounts receivable",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Current customer receivables after the allowance for credit loss. The balance is not cash collected or a guarantee of collection.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 265717000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 223443000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 206772000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 189460000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 173582000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 169146000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 157101000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 171726000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 156770000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 119885000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 75123000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 64750000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "PaymentsForRepurchaseOfCommonStock",
      "taxonomy": "us-gaap",
      "label": "Common-stock repurchase payments",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Cash paid to reacquire common stock during the period. This is not an authorization limit or a direct measure of the net change in share count.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 0,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 0,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 5955000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 14137000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 20470000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 50000000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 25000000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 10617000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "GrossProfit",
      "taxonomy": "us-gaap",
      "label": "Gross profit",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Revenue less the costs directly attributed to the goods or services sold. It precedes other operating expenses and is not net income.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 215977000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 217681000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 196680000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "CostOfRevenue",
      "taxonomy": "us-gaap",
      "label": "Cost of revenue",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Costs attributed to goods produced and sold and services provided during the period. This is not the sum of every operating expense.",
      "observations": [
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 401610000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 365127000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 342670000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "SellingGeneralAndAdministrativeExpense",
      "taxonomy": "us-gaap",
      "label": "Selling, general and administrative expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Selling and general administrative costs reported under this concept. It is an expense category, not a substitute for total operating expenses.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 122750000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 114665000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 113442000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 105654000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 89381000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 83121000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 81071000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 65128000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 55274000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 49150000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 40187000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 28098000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 22142000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "CommonStockSharesOutstanding",
      "taxonomy": "us-gaap",
      "label": "Common shares outstanding",
      "kind": "instant",
      "unitKind": "shares",
      "meaning": "Common shares outstanding at the reporting date. This point-in-time count differs from the weighted-average shares used for earnings per share and can exclude other share classes.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 88586787,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "shares"
        },
        {
          "end": "2019-12-31",
          "val": 88103566,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "shares"
        },
        {
          "end": "2018-12-31",
          "val": 85261664,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "shares"
        },
        {
          "end": "2017-12-31",
          "val": 83256858,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "shares"
        },
        {
          "end": "2016-12-31",
          "val": 83552774,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "shares"
        },
        {
          "end": "2015-12-31",
          "val": 83989715,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "shares"
        },
        {
          "end": "2014-12-31",
          "val": 87985139,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "shares"
        },
        {
          "end": "2013-12-31",
          "val": 87300148,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "shares"
        },
        {
          "end": "2012-12-31",
          "val": 86949692,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "shares"
        },
        {
          "end": "2011-12-31",
          "val": 85587299,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "shares"
        },
        {
          "end": "2010-12-31",
          "val": 83353008,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "shares"
        },
        {
          "end": "2009-12-31",
          "val": 26870560,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009Q4I",
          "unit": "shares"
        }
      ]
    },
    {
      "tag": "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
      "taxonomy": "us-gaap",
      "label": "Cash including restricted cash",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Cash, cash equivalents and restricted cash as reported in the cash flow reconciliation. Restricted amounts are not freely available, so this is not the same as unrestricted cash.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 207124000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 139268000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 178946000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 83313000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 175999000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2016Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "PropertyPlantAndEquipmentGross",
      "taxonomy": "us-gaap",
      "label": "Gross property, plant and equipment",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Cost of property, plant and equipment before accumulated depreciation. Historical cost does not indicate current value or replacement cost.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 285025000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 270866000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 270338000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 277071000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 248470000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 236892000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 237211000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 215997000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 202504000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 178163000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 84729000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
      "taxonomy": "us-gaap",
      "label": "Accumulated depreciation on property, plant and equipment",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Cumulative depreciation, depletion and amortization recorded against property, plant and equipment. It measures cost allocation to date, not physical wear or market value.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 203486000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 183919000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 175903000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 178490000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 156303000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 140341000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 121184000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 92991000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 73177000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 50986000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 40016000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IntangibleAssetsNetExcludingGoodwill",
      "taxonomy": "us-gaap",
      "label": "Net intangible assets excluding goodwill",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Intangible assets other than goodwill after amortization and impairment. Internally developed intangibles are usually not recognized, so this understates what a company relies on.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 117193000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 131849000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 67140000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 91482000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 37797000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 54308000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 74578000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 95312000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 119119000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 132740000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 19826000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OtherAssetsNoncurrent",
      "taxonomy": "us-gaap",
      "label": "Other noncurrent assets",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Noncurrent assets the filer does not present separately. The composition differs by filer and is described only in the filing.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 21674000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 10117000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 2344000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 2589000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 2650000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 4329000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 4339000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 4460000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 3988000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 837000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 904000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 983000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2009Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OtherLiabilitiesNoncurrent",
      "taxonomy": "us-gaap",
      "label": "Other noncurrent liabilities",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Noncurrent liabilities the filer does not present separately. The composition differs by filer and is described only in the filing.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 8082000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 7626000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 10012000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 9403000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 10048000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 2520000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 2864000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 3874000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 3305000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 2423000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 2582000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "DeferredTaxAssetsNet",
      "taxonomy": "us-gaap",
      "label": "Net deferred tax assets",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Deferred tax assets after the valuation allowance. Realization depends on future taxable income, so the balance is not a receivable from tax authorities.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 38176000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 34396000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 39344000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        },
        {
          "end": "2017-12-31",
          "val": 40575000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 49165000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 30196000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 27785000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 17861000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 19786000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 18885000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 12149000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "DeferredIncomeTaxLiabilitiesNet",
      "taxonomy": "us-gaap",
      "label": "Net deferred tax liabilities",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Deferred tax liabilities net of related assets under this concept. The amount reflects timing differences and is not tax currently due.",
      "observations": [
        {
          "end": "2020-12-31",
          "val": 18906000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020Q4I",
          "unit": "USD"
        },
        {
          "end": "2019-12-31",
          "val": 25587000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019Q4I",
          "unit": "USD"
        },
        {
          "end": "2018-12-31",
          "val": 18485000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2018Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ComprehensiveIncomeNetOfTax",
      "taxonomy": "us-gaap",
      "label": "Comprehensive income or loss",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Net income plus other comprehensive income after tax. It includes unrealized items that net income excludes and is not a cash measure.",
      "observations": [
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 47785000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 40092000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 30268000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 21347000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "NetIncomeLossAvailableToCommonStockholdersBasic",
      "taxonomy": "us-gaap",
      "label": "Net income available to common stockholders",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Net income after preferred dividends and similar adjustments, the numerator for basic earnings per share. It can be lower than reported net income.",
      "observations": [
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 39997000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 50516000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 47785000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 40092000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 30048000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "Depreciation",
      "taxonomy": "us-gaap",
      "label": "Depreciation expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Depreciation recognized for the period under this concept. It is a noncash allocation of asset cost and may exclude amortization and depletion reported elsewhere.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 32104000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 33293000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 33254000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 27515000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 24882000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 30328000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 32864000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 31360000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AmortizationOfIntangibleAssets",
      "taxonomy": "us-gaap",
      "label": "Amortization of intangible assets",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Amortization recognized on finite-lived intangible assets. It follows acquisition accounting and does not indicate the intangibles are losing usefulness at that rate.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 14656000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 9691000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 24342000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 22555000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 20164000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 20270000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 20734000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 23631000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 24245000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 7300000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 5500000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OtherNonoperatingIncomeExpense",
      "taxonomy": "us-gaap",
      "label": "Other nonoperating income or expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Other income or expense outside operations under this concept. The composition is filer-specific and can include one-time items.",
      "observations": [
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 801000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 382000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 632000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -69000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "CurrentIncomeTaxExpenseBenefit",
      "taxonomy": "us-gaap",
      "label": "Current income tax expense or benefit",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Income tax expense or benefit for the period that is currently payable or refundable. It differs from cash taxes paid and from total tax expense.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 23802000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 9845000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 1532000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 20209000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 19203000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 29302000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 24673000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 29947000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 39152000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 31360000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 24267000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 17855000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "DeferredIncomeTaxExpenseBenefit",
      "taxonomy": "us-gaap",
      "label": "Deferred income tax expense or benefit",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "The deferred portion of income tax expense or benefit, arising from timing differences. It is not tax paid in the period.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": -6681000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 7293000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": -3504000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": -20408000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -7368000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -14020000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": -12290000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": -4354000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": -6323000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 1818000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 2316000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 3111000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 32000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "InterestPaidNet",
      "taxonomy": "us-gaap",
      "label": "Interest paid, net",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Cash interest paid during the period, net of amounts capitalized where the filer reports it that way. It differs from interest expense recognized.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 5928000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 10457000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 10326000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 9944000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 6196000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 5694000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IncomeTaxesPaidNet",
      "taxonomy": "us-gaap",
      "label": "Income taxes paid, net",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Cash income taxes paid net of refunds during the period. It differs from income tax expense and can reflect prior years and estimated payments.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 13734000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": -5298000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 22225000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 17995000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 20326000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IncreaseDecreaseInAccountsReceivable",
      "taxonomy": "us-gaap",
      "label": "Change in accounts receivable",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "The cash flow adjustment for the change in receivables during the period. A positive value under this concept means receivables grew and reduced operating cash flow.",
      "observations": [
        {
          "start": "2020-01-01",
          "end": "2020-12-31",
          "val": 39977000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2020",
          "unit": "USD"
        },
        {
          "start": "2019-01-01",
          "end": "2019-12-31",
          "val": 16292000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2019",
          "unit": "USD"
        },
        {
          "start": "2018-01-01",
          "end": "2018-12-31",
          "val": 17312000,
          "accn": "0001196501-21-000008",
          "fy": 2020,
          "fp": "FY",
          "form": "10-K",
          "filed": "2021-02-26",
          "frame": "CY2018",
          "unit": "USD"
        },
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 6976000,
          "accn": "0001196501-20-000014",
          "fy": 2019,
          "fp": "FY",
          "form": "10-K",
          "filed": "2020-02-24",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 3554000,
          "accn": "0001171843-19-001183",
          "fy": 2018,
          "fp": "FY",
          "form": "10-K",
          "filed": "2019-02-25",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 12045000,
          "accn": "0001171843-18-001503",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-02-27",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": -14625000,
          "accn": "0001171843-17-003514",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-06-06",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 14956000,
          "accn": "0001171843-16-008257",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-02-29",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 40235000,
          "accn": "0001047469-15-001523",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 31931000,
          "accn": "0001047469-14-001708",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-03",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 9657000,
          "accn": "0001047469-13-002089",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-01",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 16593000,
          "accn": "0001047469-12-001927",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-02-29",
          "frame": "CY2009",
          "unit": "USD"
        },
        {
          "start": "2008-01-01",
          "end": "2008-12-31",
          "val": 4531000,
          "accn": "0000950123-11-020794",
          "fy": 2010,
          "fp": "FY",
          "form": "10-K",
          "filed": "2011-03-01",
          "frame": "CY2008",
          "unit": "USD"
        }
      ]
    }
  ],
  "source_snapshot": "/company-data/sources/39968238712b97d6deff48f1f50f04080309d1d71d76f19a8e2acf8045a74775.json.gz"
}
