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Restricted cash and longer-term investments may be reported separately.", "observations": [ { "end": "2025-12-31", "val": 26041000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "unit": "USD" }, { "end": "2024-12-31", "val": 24542000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024Q4I", "unit": "USD" }, { "end": "2023-12-31", "val": 33672000, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2023Q4I", "unit": "USD" }, { "end": "2022-12-31", "val": 38924000, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2022Q4I", "unit": "USD" }, { "end": "2021-12-31", "val": 105330000, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2021Q4I", "unit": "USD" }, { "end": "2020-12-31", "val": 246640000, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2020Q4I", "unit": "USD" }, { "end": "2019-12-31", "val": 60572000, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2019Q4I", "unit": "USD" }, { "end": "2018-12-31", "val": 73471000, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "unit": "USD" }, { "end": "2017-12-31", "val": 30848000, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2017Q4I", "unit": "USD" }, { "end": "2016-12-31", "val": 22894000, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2016Q4I", "unit": "USD" }, { "end": "2015-12-31", "val": 21569000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2015Q4I", "unit": "USD" }, { "end": "2014-12-31", "val": 19906000, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2014Q4I", "unit": "USD" }, { "end": "2013-12-31", "val": 42138000, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2013Q4I", "unit": "USD" }, { "end": "2012-12-31", "val": 29385000, "accn": "0000842517-16-000214", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-14", "frame": "CY2012Q4I", "unit": "USD" }, { "end": "2011-12-31", "val": 28590000, "accn": "0000842517-15-000036", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-13", "frame": "CY2011Q4I", "unit": "USD" }, { "end": "2010-12-31", "val": 18109000, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2010Q4I", "unit": "USD" }, { "end": "2009-12-31", "val": 24482000, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "frame": "CY2009Q4I", "unit": "USD" }, { "end": "2008-12-31", "val": 22979000, "accn": "0001193125-12-108381", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-12", "frame": "CY2008Q4I", "unit": "USD" } ] }, { "tag": "NetIncomeLoss", "taxonomy": "us-gaap", "label": "Net income or loss", "kind": "duration", "meaning": "Reported profit or loss for the period. 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Working-capital timing can make this differ substantially from reported income.", "observations": [ { "start": "2025-01-01", "end": "2025-12-31", "val": 26817000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 19637000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 24182000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 26886000, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 25501000, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 21997000, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 23303000, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 21963000, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 19668000, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 20240000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 12090000, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 17562000, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 23607000, "accn": "0000842517-16-000214", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-14", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 19464000, "accn": "0000842517-15-000036", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-13", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 18860000, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 26521000, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": 18225000, "accn": "0001193125-12-108381", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-12", "frame": "CY2009", "unit": "USD" } ] }, { "tag": "PaymentsToAcquirePropertyPlantAndEquipment", "taxonomy": "us-gaap", "label": "Capital expenditure payments", "kind": "duration", "meaning": "Cash payments to acquire property, plant and equipment. This taxonomy concept does not capture every form of investment or acquisition.", "observations": [ { "start": "2025-01-01", "end": "2025-12-31", "val": 3479000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 2106000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 4064000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 3205000, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 1593000, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 1518000, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 1335000, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 2305000, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 2038000, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 3804000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 5127000, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 2713000, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 2488000, "accn": "0000842517-16-000214", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-14", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 3578000, "accn": "0000842517-15-000036", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-13", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 2520000, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 3232000, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": 3035000, "accn": "0001193125-12-108381", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-12", "frame": "CY2009", "unit": "USD" } ] }, { "tag": "RevenueFromContractWithCustomerExcludingAssessedTax", "taxonomy": "us-gaap", "label": "Contract revenue excluding tax", "kind": "duration", "meaning": "Revenue from customer contracts excluding assessed taxes under this specific taxonomy concept. It is not automatically comparable to older revenue tags.", "observations": [ { "start": "2018-01-01", "end": "2018-12-31", "val": 5655000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 5385000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 5185000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2016", "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": "2025-01-01", "end": "2025-12-31", "val": 90564000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 9099000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": -3188000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 12912000, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 62824000, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 118938000, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": -51682000, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 14143000, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 69988000, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 50994000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 103072000, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 35032000, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 58828000, "accn": "0000842517-16-000214", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-14", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 78740000, "accn": "0000842517-15-000036", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-13", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 96824000, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 70983000, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": -7538000, "accn": "0001193125-12-108381", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-12", "frame": "CY2009", "unit": "USD" } ] }, { "tag": "NetCashProvidedByUsedInInvestingActivities", "taxonomy": "us-gaap", "label": "Investing cash flow", "kind": "duration", "unitKind": "money", "meaning": "Net cash from investing activities, including asset purchases, disposals and investment transactions. This differs from capital expenditure payments alone.", "observations": [ { "start": "2025-01-01", "end": "2025-12-31", "val": -115882000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": -37866000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": -26246000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": -106204000, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": -229635000, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 45133000, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 15480000, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 6517000, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": -81702000, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": -69909000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": -113499000, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": -74826000, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": -69682000, "accn": "0000842517-16-000214", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-14", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": -101874000, "accn": "0000842517-15-000036", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-13", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": -105203000, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": -103877000, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": -9184000, "accn": "0001193125-12-108381", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-12", "frame": "CY2009", "unit": "USD" } ] }, { "tag": "RetainedEarningsAccumulatedDeficit", "taxonomy": "us-gaap", "label": "Retained earnings or deficit", "kind": "instant", "unitKind": "money", "meaning": "Accumulated undistributed earnings or deficit at the reporting date. This balance is not cash available for distribution.", "observations": [ { "end": "2025-12-31", "val": 113849000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "unit": "USD" }, { "end": "2024-12-31", "val": 103024000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024Q4I", "unit": "USD" }, { "end": "2023-12-31", "val": 97282000, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2023Q4I", "unit": "USD" }, { "end": "2022-12-31", "val": 89748000, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2022Q4I", "unit": "USD" }, { "end": "2021-12-31", "val": 75592000, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2021Q4I", "unit": "USD" }, { "end": "2020-12-31", "val": 64460000, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2020Q4I", "unit": "USD" }, { "end": "2019-12-31", "val": 62099000, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2019Q4I", "unit": "USD" }, { "end": "2018-12-31", "val": 57357000, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2018Q4I", "unit": "USD" }, { "end": "2017-12-31", "val": 51728000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2017Q4I", "unit": "USD" }, { "end": "2016-12-31", "val": 46114000, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2016Q4I", "unit": "USD" }, { "end": "2015-12-31", "val": 39960000, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2015Q4I", "unit": "USD" }, { "end": "2014-12-31", "val": 32103000, "accn": "0000842517-16-000214", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-14", "frame": "CY2014Q4I", "unit": "USD" }, { "end": "2013-12-31", "val": 25222000, "accn": "0000842517-15-000036", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-13", "frame": "CY2013Q4I", "unit": "USD" }, { "end": "2012-12-31", "val": 19168000, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2012Q4I", "unit": "USD" }, { "end": "2011-12-31", "val": 13036000, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "frame": "CY2011Q4I", "unit": "USD" }, { "end": "2010-12-31", "val": 8596000, "accn": "0001193125-12-108381", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-12", "frame": "CY2010Q4I", "unit": "USD" } ] }, { "tag": "WeightedAverageNumberOfSharesOutstandingBasic", "taxonomy": "us-gaap", "label": "Basic weighted-average shares", "kind": "duration", "unitKind": "shares", "meaning": "Time-weighted shares used for basic earnings per share. This denominator differs from shares outstanding at a single reporting date.", "observations": [ { "start": "2025-01-01", "end": "2025-12-31", "val": 7372434, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2025", "unit": "shares" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 7465343, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024", "unit": "shares" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 7511591, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2023", "unit": "shares" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 7549878, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2022", "unit": "shares" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 7853398, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2021", "unit": "shares" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 7959705, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2020", "unit": "shares" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 7909794, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2019", "unit": "shares" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 7872077, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2018", "unit": "shares" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 7841451, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2017", "unit": "shares" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 7813739, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2016", "unit": "shares" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 7775988, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2015", "unit": "shares" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 7734161, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2014", "unit": "shares" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 7694392, "accn": "0000842517-16-000214", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-14", "frame": "CY2013", "unit": "shares" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 7604303, "accn": "0000842517-15-000036", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-13", "frame": "CY2012", "unit": "shares" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 7572841, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2011", "unit": "shares" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 7541676, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "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": "2025-01-01", "end": "2025-12-31", "val": 7385862, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2025", "unit": "shares" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 7482374, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024", "unit": "shares" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 7575492, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2023", "unit": "shares" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 7647612, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2022", "unit": "shares" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 7965961, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2021", "unit": "shares" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 8106091, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2020", "unit": "shares" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 8095042, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2019", "unit": "shares" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 8072848, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2018", "unit": "shares" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 8033737, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2017", "unit": "shares" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 7999350, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2016", "unit": "shares" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 7953976, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2015", "unit": "shares" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 7905554, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2014", "unit": "shares" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 7863340, "accn": "0000842517-16-000214", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-14", "frame": "CY2013", "unit": "shares" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 7799366, "accn": "0000842517-15-000036", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-13", "frame": "CY2012", "unit": "shares" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 7767475, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2011", "unit": "shares" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 7729420, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "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": "2025-01-01", "end": "2025-12-31", "val": 2.56, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2025", "unit": "USD/shares" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 1.86, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024", "unit": "USD/shares" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 2.42, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2023", "unit": "USD/shares" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 2.95, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2022", "unit": "USD/shares" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 2.48, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2021", "unit": "USD/shares" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 1.37, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2020", "unit": "USD/shares" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 1.65, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2019", "unit": "USD/shares" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 1.78, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2018", "unit": "USD/shares" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 1.69, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2017", "unit": "USD/shares" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 1.77, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2016", "unit": "USD/shares" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 1.95, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2015", "unit": "USD/shares" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 1.77, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2014", "unit": "USD/shares" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 1.63, "accn": "0000842517-16-000214", "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": 1.61, "accn": "0000842517-15-000036", "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": 1.35, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2011", "unit": "USD/shares" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 1.2, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "frame": "CY2010", "unit": "USD/shares" }, { "start": "2009-01-01", "end": "2009-12-31", "val": 1.04, "accn": "0001193125-12-108381", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-12", "frame": "CY2009", "unit": "USD/shares" } ] }, { "tag": "EarningsPerShareDiluted", "taxonomy": "us-gaap", "label": "Diluted earnings per share", "kind": "duration", "unitKind": "per-share", "meaning": "Reported earnings or loss per share under dilution rules. Antidilutive instruments may be excluded. A diluted value can equal the basic value without implying no potential dilution.", "observations": [ { "start": "2025-01-01", "end": "2025-12-31", "val": 2.56, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2025", "unit": "USD/shares" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 1.86, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024", "unit": "USD/shares" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 2.4, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2023", "unit": "USD/shares" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 2.91, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2022", "unit": "USD/shares" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 2.45, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2021", "unit": "USD/shares" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 1.34, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2020", "unit": "USD/shares" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 1.61, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2019", "unit": "USD/shares" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 1.74, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2018", "unit": "USD/shares" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 1.65, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2017", "unit": "USD/shares" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 1.73, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2016", "unit": "USD/shares" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 1.9, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2015", "unit": "USD/shares" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 1.74, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2014", "unit": "USD/shares" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 1.59, "accn": "0000842517-16-000214", "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": 1.56, "accn": "0000842517-15-000036", "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": 1.31, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2011", "unit": "USD/shares" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 1.17, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "frame": "CY2010", "unit": "USD/shares" }, { "start": "2009-01-01", "end": "2009-12-31", "val": 1.01, "accn": "0001193125-12-108381", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-12", "frame": "CY2009", "unit": "USD/shares" } ] }, { "tag": "IncomeTaxExpenseBenefit", "taxonomy": "us-gaap", "label": "Income tax expense or benefit", "kind": "duration", "unitKind": "money", "meaning": "Current and deferred income tax expense or benefit for continuing operations. This accounting expense differs from cash taxes paid.", "observations": [ { "start": "2025-01-01", "end": "2025-12-31", "val": 5213000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 2509000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 3665000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 4606000, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 3848000, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 987000, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 1380000, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 1363000, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 3016000, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 2348000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 3288000, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 2344000, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 2196000, "accn": "0000842517-16-000214", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-14", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 2363000, "accn": "0000842517-15-000036", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-13", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 1354000, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2011", "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": "2025-12-31", "val": 29000000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "unit": "USD" }, { "end": "2024-12-31", "val": 27659000, "accn": "0000842517-26-000069", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-03-13", "frame": "CY2024Q4I", "unit": "USD" }, { "end": "2023-12-31", "val": 27639000, "accn": "0000842517-25-000053", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-03-12", "frame": "CY2023Q4I", "unit": "USD" }, { "end": "2022-12-31", "val": 25553000, "accn": "0000842517-24-000048", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-03-07", "frame": "CY2022Q4I", "unit": "USD" }, { "end": "2021-12-31", "val": 24419000, "accn": "0000842517-23-000055", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-03-07", "frame": "CY2021Q4I", "unit": "USD" }, { "end": "2020-12-31", "val": 25140000, "accn": "0000842517-22-000061", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-03-15", "frame": "CY2020Q4I", "unit": "USD" }, { "end": "2019-12-31", "val": 26242000, "accn": "0000842517-21-000069", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-03-10", "frame": "CY2019Q4I", "unit": "USD" }, { "end": "2018-12-31", "val": 27815000, "accn": "0000842517-20-000040", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-03-16", "frame": "CY2018Q4I", "unit": "USD" }, { "end": "2017-12-31", "val": 28450000, "accn": "0000842517-19-000052", "fy": 2018, "fp": "FY", "form": "10-K", "filed": "2019-03-14", "frame": "CY2017Q4I", "unit": "USD" }, { "end": "2016-12-31", "val": 29314000, "accn": "0000842517-18-000059", "fy": 2017, "fp": "FY", "form": "10-K", "filed": "2018-03-16", "frame": "CY2016Q4I", "unit": "USD" }, { "end": "2015-12-31", "val": 28331000, "accn": "0000842517-17-000068", "fy": 2016, "fp": "FY", "form": "10-K", "filed": "2017-03-07", "frame": "CY2015Q4I", "unit": "USD" }, { "end": "2014-12-31", "val": 25881000, "accn": "0000842517-16-000214", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-14", "frame": "CY2014Q4I", "unit": "USD" }, { "end": "2013-12-31", "val": 25719000, "accn": "0000842517-15-000036", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-13", "frame": "CY2013Q4I", "unit": "USD" }, { "end": "2012-12-31", "val": 25787000, "accn": "0000842517-14-000053", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-10", "frame": "CY2012Q4I", "unit": "USD" }, { "end": "2011-12-31", "val": 24626000, "accn": "0001193125-13-106679", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-14", "frame": "CY2011Q4I", "unit": "USD" }, { "end": "2010-12-31", "val": 24627000, "accn": "0001193125-12-108381", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-12", "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. 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