{
  "schema": "canli.company-reference.v1",
  "cik": "0000914138",
  "name": "MIDDLEBURG FINANCIAL CORP",
  "selection_policy": "extended-v23",
  "source_url": "https://data.sec.gov/api/xbrl/companyfacts/CIK0000914138.json",
  "source_sha256": "6b6dd54ad36817039960f74c5fbaa9fa7238b059bdd8067f238dc2ad8a53a0e4",
  "fetched_at": "2026-09-23T02:43:18.005Z",
  "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": "2016-12-31",
          "val": 1272643000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 1294863000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 1222857000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 1227753000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 1236781000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 1192860000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 1104567000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "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": "2016-12-31",
          "val": 1145964000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 1171309000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 1100823000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 1112680000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 1119659000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 1084847000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 1004574000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2014-12-31",
          "val": 122034000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 112575000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 113928000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 105912000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 96953000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2010Q4I",
          "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": "2016-12-31",
          "val": 28544000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 39228000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 55022000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 67343000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 54415000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 51270000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 64724000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 43210000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2009Q4I",
          "unit": "USD"
        },
        {
          "end": "2008-12-31",
          "val": 35380000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 8064000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 7830000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 7584000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 6154000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 6486000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 4960000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -2688000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 3522000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 15977000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 12303000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 48789000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 67091000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 28356000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": -21497000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -381000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -677000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2015-01-01",
          "end": "2015-12-31",
          "val": 2137000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": -321000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 928000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1045000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 1294000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 939000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 1979000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": -28034000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 65240000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": -16417000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": -11194000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 31000000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 78647000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 128055000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -11191000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 1373000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -93337000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": -44693000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": -42969000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": -56211000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": -70604000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -106160000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 19698000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2016-12-31",
          "val": 64755000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 60392000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 55854000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 50689000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 46235000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 41157000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 37593000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 7107403,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 7147390,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 7106171,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 7074410,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 7031971,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "shares"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 6974781,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 6933144,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 7150890,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 7167387,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 7126601,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "shares"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 7107146,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 7043119,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "shares"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 6976902,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 6933144,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 1.13,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD/shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 1.1,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD/shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 1.07,
          "accn": "0000914138-17-000014",
          "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": 0.87,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD/shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 0.92,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD/shares"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 0.71,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD/shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -0.39,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD/shares"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 0.37,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 1.13,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD/shares"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 1.09,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD/shares"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 1.06,
          "accn": "0000914138-17-000014",
          "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": 0.87,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD/shares"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 0.92,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD/shares"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 0.71,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD/shares"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -0.39,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD/shares"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 0.37,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 2813000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 2715000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 2341000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 1931000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1966000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 1350000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -2562000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 64000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2016-12-31",
          "val": 19021000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 19531000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 18104000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 20017000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 20587000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 21306000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 21112000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ShareBasedCompensation",
      "taxonomy": "us-gaap",
      "label": "Share-based compensation expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Reported noncash expense for share-based payment arrangements. Noncash treatment does not mean the awards have no economic cost to shareholders.",
      "observations": [
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 925000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 605000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 426000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 492000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 440000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 471000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 158000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 119000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2009",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 54113000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 52671000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 58111000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 68811000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 76477000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 68598000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 68821000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "InterestExpense",
      "taxonomy": "us-gaap",
      "label": "Interest expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Borrowing costs recognized as interest expense. This is distinct from cash interest paid and may not include every capitalized borrowing cost.",
      "observations": [
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 4424000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 4207000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 5243000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 6567000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 8824000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 10691000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 14175000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 19082000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2009",
          "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": "2016-12-31",
          "val": 44000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 215000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 386000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 557000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 728000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2012Q4I",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 842000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 1506000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 125000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 103000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 43000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 14000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 0,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 0,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 43236000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 42126000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 48284000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 60717000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 66521000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 62586000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 73431000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "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": "2016-12-31",
          "val": 7205066,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "shares"
        },
        {
          "end": "2015-12-31",
          "val": 7085217,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "shares"
        },
        {
          "end": "2014-12-31",
          "val": 7131643,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2014Q4I",
          "unit": "shares"
        },
        {
          "end": "2013-12-31",
          "val": 7080591,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2013Q4I",
          "unit": "shares"
        },
        {
          "end": "2012-12-31",
          "val": 7052554,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2012Q4I",
          "unit": "shares"
        },
        {
          "end": "2011-12-31",
          "val": 6996932,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2011Q4I",
          "unit": "shares"
        },
        {
          "end": "2010-12-31",
          "val": 6925437,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2010Q4I",
          "unit": "shares"
        }
      ]
    },
    {
      "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": "2016-12-31",
          "val": -1400000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 1677000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 3794000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 232000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 6467000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 3926000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": -1012000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2010Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
      "taxonomy": "us-gaap",
      "label": "Total equity including noncontrolling interests",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Equity including the portion attributable to noncontrolling interests. It is larger than or equal to parent stockholders equity and is not market capitalization.",
      "observations": [
        {
          "end": "2016-12-31",
          "val": 126679000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 123554000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 122034000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 115073000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 117122000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 108013000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2011Q4I",
          "unit": "USD"
        },
        {
          "end": "2010-12-31",
          "val": 99993000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2010Q4I",
          "unit": "USD"
        },
        {
          "end": "2009-12-31",
          "val": 103359000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2009Q4I",
          "unit": "USD"
        },
        {
          "end": "2008-12-31",
          "val": 77605000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2008Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "LongTermDebt",
      "taxonomy": "us-gaap",
      "label": "Long-term debt",
      "kind": "instant",
      "unitKind": "money",
      "meaning": "Long-term borrowings under this concept, which can include the current portion depending on presentation. It is not total liabilities and may exclude leases and other obligations.",
      "observations": [
        {
          "end": "2016-12-31",
          "val": 39500000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 85000000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 55000000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 80000000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 77912000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2012Q4I",
          "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": "2016-12-31",
          "val": 38512000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 38048000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 35455000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 37385000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 36693000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 37017000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "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": "2016-12-31",
          "val": 19491000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016Q4I",
          "unit": "USD"
        },
        {
          "end": "2015-12-31",
          "val": 18517000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015Q4I",
          "unit": "USD"
        },
        {
          "end": "2014-12-31",
          "val": 17351000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2014Q4I",
          "unit": "USD"
        },
        {
          "end": "2013-12-31",
          "val": 17368000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2013Q4I",
          "unit": "USD"
        },
        {
          "end": "2012-12-31",
          "val": 16106000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2012Q4I",
          "unit": "USD"
        },
        {
          "end": "2011-12-31",
          "val": 15711000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2011Q4I",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ProfitLoss",
      "taxonomy": "us-gaap",
      "label": "Profit or loss including noncontrolling interests",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Net income or loss including the portion attributable to noncontrolling interests. It can differ from the net income attributable to the parent that per-share figures use.",
      "observations": [
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 8064000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 7830000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 7486000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 6163000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 7990000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 4662000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -2326000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 5099000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2009",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 4987000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 5713000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 11146000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": -81000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 9027000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 9898000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -1226000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "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": "2012-01-01",
          "end": "2012-12-31",
          "val": 6486000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 4960000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -2688000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 2106000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "Depreciation",
      "taxonomy": "us-gaap",
      "label": "Depreciation expense",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Depreciation recognized for the period under this concept. It is a noncash allocation of asset cost and may exclude amortization and depletion reported elsewhere.",
      "observations": [
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 1400000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 1300000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 1500000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 1800000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1800000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 1600000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 1400000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "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": 2584000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 2352000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 2339000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 1983000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1953000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 1882000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 1753000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "CurrentIncomeTaxExpenseBenefit",
      "taxonomy": "us-gaap",
      "label": "Current income tax expense or benefit",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Income tax expense or benefit for the period that is currently payable or refundable. It differs from cash taxes paid and from total tax expense.",
      "observations": [
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 2067000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 2606000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 1160000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 2315000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 759000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 825000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 611000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "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": "2016-01-01",
          "end": "2016-12-31",
          "val": 746000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 109000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 1181000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": -384000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 1207000,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 525000,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": -3173000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": -708000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "ProceedsFromIssuanceOfCommonStock",
      "taxonomy": "us-gaap",
      "label": "Proceeds from issuing common stock",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "Cash received from issuing common stock during the period. It is gross of costs only where the filer reports it so, and it does not include noncash issuances.",
      "observations": [
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 1742000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 0,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 394000,
          "accn": "0000914138-17-000014",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-15",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 39000,
          "accn": "0000914138-16-000028",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-14",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 0,
          "accn": "0000914138-15-000005",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-13",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 0,
          "accn": "0000914138-14-000006",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 134000,
          "accn": "0001002105-13-000029",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-18",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 24229000,
          "accn": "0001002105-12-000030",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    }
  ],
  "source_snapshot": "/company-data/sources/6b6dd54ad36817039960f74c5fbaa9fa7238b059bdd8067f238dc2ad8a53a0e4.json.gz"
}
