{
  "schema": "canli.company-reference.v1",
  "cik": "0001017968",
  "name": "EDGEWATER TECHNOLOGY INC/DE/",
  "selection_policy": "extended-v23",
  "source_url": "https://data.sec.gov/api/xbrl/companyfacts/CIK0001017968.json",
  "source_sha256": "a7b0de95042b0f30bf2173cbf2c7fbba5f036b9ed98cbf4398d21d350fa38b34",
  "fetched_at": "2026-09-22T19:37:57.534Z",
  "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": "2017-12-31",
          "val": 75874000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 104805000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 107424000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 93413000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 86067000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 51789000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 51198000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 50276000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "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": "2017-12-31",
          "val": 22891000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 29031000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 34040000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 18384000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 17481000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 19114000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 19485000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 17311000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "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": "2017-12-31",
          "val": 52983000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 75774000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 73384000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 75029000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 68586000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 32675000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 31713000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 32965000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 55116000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2009Q4I",
          "unit": "USD"
        },
        {
          "end": "2008-12-31",
          "val": 57958000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2008Q4I",
          "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": "2017-12-31",
          "val": 15398000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 19693000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 11981000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 26768000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 20321000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 16651000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 10333000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 10903000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 5889000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2009Q4I",
          "unit": "USD"
        },
        {
          "end": "2008-12-31",
          "val": 13618000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2008Q4I",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": -29136000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -2834000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -4060000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 4064000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 34708000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1447000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 344000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -23572000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -3839000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2013-01-01",
          "end": "2013-12-31",
          "val": 4733000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 8836000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 5833000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 698000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -243000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 176000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 377000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 333000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 220000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 311000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 357000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 518000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 368000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 32000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "Revenues",
      "taxonomy": "us-gaap",
      "label": "Revenue",
      "kind": "duration",
      "meaning": "Revenue under this specific accounting concept. A missing value is not zero; filers can use other revenue concepts.",
      "observations": [
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 111753000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 126522000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 116704000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 112989000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 103556000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 100881000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 102443000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 88545000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 50085000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2013-01-01",
          "end": "2013-12-31",
          "val": -266000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": -1932000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": -2894000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 222000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -363000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2013-01-01",
          "end": "2013-12-31",
          "val": -807000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": -592000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": -3498000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 4098000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -7123000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-12-31",
          "val": -50797000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": -23053000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": -20219000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": -16159000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": -20223000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": -54931000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": -56378000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": -56722000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 13623000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "shares"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 12150000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 11505000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 11131000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 10813000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 11180000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "shares"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 12038000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 12195000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "shares"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 12067000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 13623000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "shares"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 12150000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 11505000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 13090000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 12031000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 11589000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "shares"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 12048000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 12195000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "shares"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 12067000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": -2.14,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD/shares"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -0.23,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD/shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -0.35,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD/shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 0.37,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD/shares"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 3.21,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD/shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 0.13,
          "accn": "0001193125-15-073068",
          "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": 0.03,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD/shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -1.93,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD/shares"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -0.32,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": -2.14,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD/shares"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -0.23,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD/shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -0.35,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD/shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 0.31,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD/shares"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 2.88,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD/shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 0.13,
          "accn": "0001193125-15-073068",
          "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": 0.03,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD/shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -1.93,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD/shares"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -0.32,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 19615000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 5030000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 3529000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 3177000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": -30089000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 401000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 843000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 21395000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -1047000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-12-31",
          "val": 409000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 623000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 824000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 1029000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 1437000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 1949000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 2429000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 2797000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": -9219000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 4523000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 1482000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 7422000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 4711000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1915000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 1314000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -2211000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -5008000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-12-31",
          "val": 39691000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 46562000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 40438000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 52475000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 42274000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 36350000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 34403000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 31434000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "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": "2017-12-31",
          "val": 22891000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 24031000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 25572000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 17973000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 16721000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 17842000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 17539000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 17244000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AccountsPayableCurrent",
      "taxonomy": "us-gaap",
      "label": "Current accounts payable",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Current amounts owed to suppliers for goods and services received. This is one component of current liabilities, not all accrued obligations.",
      "observations": [
        {
          "end": "2017-12-31",
          "val": 767000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 634000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 586000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 315000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 680000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 593000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 1858000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 604000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "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": "2017-12-31",
          "val": 29983000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 29983000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 29910000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 12049000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 12049000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 12049000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 12049000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 12049000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010Q4I",
          "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": "2017-12-31",
          "val": 5575000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 8378000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 11990000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 480000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 956000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 1194000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 2079000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "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": "2017-12-31",
          "val": 22218000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 25661000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 27753000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 24654000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 19842000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 18281000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 23307000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 19496000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 1286000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 332000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 967000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 1513000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 2643000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 3229000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 579000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OperatingExpenses",
      "taxonomy": "us-gaap",
      "label": "Operating expenses",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Recurring operating costs under this accounting concept, generally excluding production costs included in cost of sales. Check filing presentation before combining expense subtotals.",
      "observations": [
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 48917000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 41659000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 38108000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 33944000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 32861000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 33364000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 37383000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 34286000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 21106000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 39698000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 46182000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 39590000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 41366000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 37572000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 35279000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 38697000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 32075000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 16098000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 72055000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 80340000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 77114000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 71623000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 65984000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 65602000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 63746000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 56470000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 33987000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 40034000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 37747000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 34592000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 34145000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 31636000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 31563000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 32307000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 30263000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 18412000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-12-31",
          "val": 14046000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "shares"
        },
        {
          "end": "2016-12-31",
          "val": 12878000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "shares"
        },
        {
          "end": "2015-12-31",
          "val": 11862000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "shares"
        },
        {
          "end": "2014-12-31",
          "val": 11440000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "shares"
        },
        {
          "end": "2013-12-31",
          "val": 11049000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "shares"
        },
        {
          "end": "2012-12-31",
          "val": 10897000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "shares"
        },
        {
          "end": "2011-12-31",
          "val": 11311000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "shares"
        },
        {
          "end": "2010-12-31",
          "val": 12342000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "unit": "shares"
        }
      ]
    },
    {
      "tag": "AdditionalPaidInCapital",
      "taxonomy": "us-gaap",
      "label": "Additional paid-in capital",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Capital contributed above par value under this concept. It records historical contributions, not the current value of the equity or cash on hand.",
      "observations": [
        {
          "end": "2014-12-31",
          "val": 210989000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 211852000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 213238000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 213282000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 213326000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AccumulatedOtherComprehensiveIncomeLossNetOfTax",
      "taxonomy": "us-gaap",
      "label": "Accumulated other comprehensive income or loss",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Cumulative other comprehensive items after tax, such as translation and unrealized hedging or securities effects. These amounts have not passed through net income.",
      "observations": [
        {
          "end": "2017-12-31",
          "val": -582000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": -580000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": -554000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": -220000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": -154000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": -123000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": -99000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": -48000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "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": "2017-12-31",
          "val": 5276000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 5425000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 6072000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 5808000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 5968000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 6002000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 5892000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "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": "2017-12-31",
          "val": 4867000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017Q4I",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 4802000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 5248000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 4779000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 4531000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 4053000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 3463000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "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": "2017-12-31",
          "val": 5575000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 8378000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 11990000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 480000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 956000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 1194000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 2079000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 3821000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "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": "2017-12-31",
          "val": 216000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 228000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 230000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 210000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 254000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 247000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 238000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 175000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "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": "2014-12-31",
          "val": 411000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 760000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 1272000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 1841000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 15000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "AccruedLiabilitiesCurrent",
      "taxonomy": "us-gaap",
      "label": "Accrued current liabilities",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Current obligations accrued for goods and services received but not yet invoiced or paid. This is one component of current liabilities, not all short-term obligations.",
      "observations": [
        {
          "end": "2017-12-31",
          "val": 14984000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 13497000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 15486000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 16142000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 14326000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 14280000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 13934000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 12391000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "PrepaidExpenseAndOtherAssetsCurrent",
      "taxonomy": "us-gaap",
      "label": "Prepaid expenses and other current assets",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Prepayments and other current assets grouped under this concept. The balance is not cash and its composition differs by filer.",
      "observations": [
        {
          "end": "2017-12-31",
          "val": 2075000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "unit": "USD"
        },
        {
          "end": "2016-12-31",
          "val": 1208000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 704000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 1053000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 936000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 1412000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 763000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 1035000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
      "taxonomy": "us-gaap",
      "label": "Pre-tax income or loss from continuing operations",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Income or loss from continuing operations before income taxes and noncontrolling interests. It excludes discontinued operations and is not net income.",
      "observations": [
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": -9521000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 2196000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -531000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 7241000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 4619000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": -29138000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -2860000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -4394000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 3998000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 34677000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1423000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 293000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -23626000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": -29136000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -2834000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -4060000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 4064000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 34708000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1447000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 361000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 590000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 618000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 626000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 814000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 837000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 875000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 879000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "DepreciationDepletionAndAmortization",
      "taxonomy": "us-gaap",
      "label": "Depreciation, depletion and amortization",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Combined depreciation, depletion and amortization for the period. A noncash allocation of asset cost, not a measure of maintenance spending.",
      "observations": [
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 4202000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 1708000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 1142000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 1552000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1957000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 2885000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 4023000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 2694000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 2800000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 3400000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 899000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 302000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 738000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1100000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 1100000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 2000000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": -302000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -2327000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -2013000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": -181000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": -92000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": -67000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": -127000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 34000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 122000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 305000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 176000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 425000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 445000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 329000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 356000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 707000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 208000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": 19335000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 4854000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 3137000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 3102000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": -30390000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 28000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 58000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 21108000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -1156000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "OperatingLeasePayments",
      "taxonomy": "us-gaap",
      "label": "Operating lease payments",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Cash paid for operating lease liabilities during the period. It differs from lease expense recognized and excludes variable payments in some presentations.",
      "observations": [
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 952000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 1800000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 2100000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "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": "2017-01-01",
          "end": "2017-12-31",
          "val": -3337000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -1960000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -1548000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 4839000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 1508000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": -5046000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 3558000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 1398000,
          "accn": "0001193125-13-097839",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-08",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -2859000,
          "accn": "0001193125-12-109956",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-12",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IncreaseDecreaseInAccountsPayable",
      "taxonomy": "us-gaap",
      "label": "Change in accounts payable",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "The cash flow adjustment for the change in payables during the period. A positive value under this concept means payables grew and added to operating cash flow.",
      "observations": [
        {
          "start": "2017-01-01",
          "end": "2017-12-31",
          "val": 133000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2017",
          "unit": "USD"
        },
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 48000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 100000,
          "accn": "0001193125-18-086033",
          "fy": 2017,
          "fp": "FY",
          "form": "10-K",
          "filed": "2018-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": -364000,
          "accn": "0001193125-17-083628",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 87000,
          "accn": "0001193125-16-501510",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-11",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": -1265000,
          "accn": "0001193125-15-073068",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-02",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 1254000,
          "accn": "0001193125-14-091264",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-10",
          "frame": "CY2011",
          "unit": "USD"
        }
      ]
    }
  ],
  "source_snapshot": "/company-data/sources/a7b0de95042b0f30bf2173cbf2c7fbba5f036b9ed98cbf4398d21d350fa38b34.json.gz"
}
