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Restricted cash and longer-term investments may be reported separately.", "observations": [ { "end": "2023-12-31", "val": 888707000, "accn": "0000845877-24-000028", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-23", "unit": "USD" }, { "end": "2022-12-31", "val": 861002000, "accn": "0000845877-24-000028", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-23", "frame": "CY2022Q4I", "unit": "USD" }, { "end": "2021-12-31", "val": 908785000, "accn": "0000845877-23-000026", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-24", "frame": "CY2021Q4I", "unit": "USD" }, { "end": "2020-12-31", "val": 1033941000, "accn": "0000845877-22-000022", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-28", "frame": "CY2020Q4I", "unit": "USD" }, { "end": "2019-12-31", "val": 604381000, "accn": "0000845877-21-000024", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-25", "frame": "CY2019Q4I", "unit": "USD" }, { "end": "2018-12-31", "val": 425256000, "accn": "0000845877-20-000029", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-25", "frame": "CY2018Q4I", "unit": "USD" }, { "end": "2017-12-31", "val": 302022000, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2017Q4I", "unit": "USD" }, { "end": "2016-12-31", "val": 265229000, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2016Q4I", "unit": "USD" }, { "end": "2015-12-31", "val": 1210084000, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2015Q4I", "unit": "USD" }, { "end": "2014-12-31", "val": 1363387000, "accn": "0000845877-18-000017", "fy": 2017, "fp": "Q4", "form": "10-K", "filed": "2018-03-08", "frame": "CY2014Q4I", "unit": "USD" }, { "end": "2014-09-30", "val": 1363387000, "accn": "0000845877-16-000187", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-10", "frame": "CY2014Q3I", "unit": "USD" }, { "end": "2013-12-31", "val": 749313000, "accn": "0000845877-17-000018", "fy": 2016, "fp": "Q4", "form": "10-K", "filed": "2017-03-09", "frame": "CY2013Q4I", "unit": "USD" }, { "end": "2012-12-31", "val": 785564000, "accn": "0000845877-16-000187", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-10", "frame": "CY2012Q4I", "unit": "USD" }, { "end": "2011-12-31", "val": 817046000, "accn": "0000845877-15-000035", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-16", "frame": "CY2011Q4I", "unit": "USD" }, { "end": "2010-12-31", "val": 729920000, "accn": "0000845877-14-000026", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-13", "unit": "USD" }, { "end": "2009-12-31", "val": 654794000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2009Q4I", "unit": "USD" }, { "end": "2008-12-31", "val": 278412000, "accn": "0000845877-12-000009", "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": "2025-01-01", "end": "2025-12-31", "val": 207415000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 207193000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 200003000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 178144000, "accn": "0000845877-25-000033", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-21", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 136089000, "accn": "0000845877-24-000028", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-23", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 114376000, "accn": "0000845877-23-000026", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-24", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 109546000, "accn": "0000845877-22-000022", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-28", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 108080000, "accn": "0000845877-21-000024", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-25", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 84482000, "accn": "0000845877-20-000029", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-25", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 77334000, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 68700000, "accn": "0000845877-18-000017", "fy": 2017, "fp": "Q4", "form": "10-K", "filed": "2018-03-08", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 48090000, "accn": "0000845877-17-000018", "fy": 2016, "fp": "Q4", "form": "10-K", "filed": "2017-03-09", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 75328000, "accn": "0000845877-16-000187", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-10", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 46773000, "accn": "0000845877-15-000035", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-16", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 16663000, "accn": "0000845877-14-000026", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-13", "unit": "USD" }, { "start": "2010-12-31", "end": "2011-12-31", "val": 16663000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 31993000, "accn": "0000845877-12-000009", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-15", "unit": "USD" }, { "start": "2009-12-31", "end": "2010-12-31", "val": 31993000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": 99600000, "accn": "0000845877-12-000009", "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": "2025-01-01", "end": "2025-12-31", "val": 80062000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 612646000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 375798000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 809271000, "accn": "0000845877-25-000033", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-21", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 436412000, "accn": "0000845877-24-000028", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-23", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": -94547000, "accn": "0000845877-23-000026", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-24", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": -19699000, "accn": "0000845877-22-000022", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-28", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 200031000, "accn": "0000845877-21-000024", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-25", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 175011000, "accn": "0000845877-20-000029", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-25", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 212691000, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 184898000, "accn": "0000845877-18-000017", "fy": 2017, "fp": "Q4", "form": "10-K", "filed": "2018-03-08", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 155052000, "accn": "0000845877-17-000018", "fy": 2016, "fp": "Q4", "form": "10-K", "filed": "2017-03-09", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 313990000, "accn": "0000845877-16-000187", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-10", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 33303000, "accn": "0000845877-15-000035", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-16", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 26820000, "accn": "0000845877-14-000026", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-13", "unit": "USD" }, { "start": "2010-12-31", "end": "2011-12-31", "val": 26820000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": -538813000, "accn": "0000845877-12-000009", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-15", "unit": "USD" }, { "start": "2009-12-31", "end": "2010-12-31", "val": -538813000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": 73290000, "accn": "0000845877-12-000009", "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": "2025-01-01", "end": "2025-12-31", "val": 3639770000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 1205127000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 1607288000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 2185905000, "accn": "0000845877-25-000033", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-21", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 534628000, "accn": "0000845877-24-000028", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-23", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 2260198000, "accn": "0000845877-23-000026", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-24", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 2583411000, "accn": "0000845877-22-000022", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-28", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 514665000, "accn": "0000845877-21-000024", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-25", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 1704387000, "accn": "0000845877-20-000029", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-25", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": -564137000, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 912332000, "accn": "0000845877-18-000017", "fy": 2017, "fp": "Q4", "form": "10-K", "filed": "2018-03-08", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 542684000, "accn": "0000845877-17-000018", "fy": 2016, "fp": "Q4", "form": "10-K", "filed": "2017-03-09", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 644852000, "accn": "0000845877-16-000187", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-10", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 1264025000, "accn": "0000845877-15-000035", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-16", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 2065120000, "accn": "0000845877-14-000026", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-13", "unit": "USD" }, { "start": "2010-12-31", "end": "2011-12-31", "val": 2065120000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 2250188000, "accn": "0000845877-12-000009", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-15", "unit": "USD" }, { "start": "2009-12-31", "end": "2010-12-31", "val": 2250188000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": 942727000, "accn": "0000845877-12-000009", "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": "2025-01-01", "end": "2025-12-31", "val": -3812772000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2025", "unit": "USD" }, { "start": "2024-01-01", "end": "2024-12-31", "val": -1682473000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2024", "unit": "USD" }, { "start": "2023-01-01", "end": "2023-12-31", "val": -1955381000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2023", "unit": "USD" }, { "start": "2022-01-01", "end": "2022-12-31", "val": -3042959000, "accn": "0000845877-25-000033", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-21", "frame": "CY2022", "unit": "USD" }, { "start": "2021-01-01", "end": "2021-12-31", "val": -1096196000, "accn": "0000845877-24-000028", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-23", "frame": "CY2021", "unit": "USD" }, { "start": "2020-01-01", "end": "2020-12-31", "val": -1736091000, "accn": "0000845877-23-000026", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-24", "frame": "CY2020", "unit": "USD" }, { "start": "2019-01-01", "end": "2019-12-31", "val": -2384587000, "accn": "0000845877-22-000022", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-28", "frame": "CY2019", "unit": "USD" }, { "start": "2018-01-01", "end": "2018-12-31", "val": -591462000, "accn": "0000845877-21-000024", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-25", "frame": "CY2018", "unit": "USD" }, { "start": "2017-01-01", "end": "2017-12-31", "val": -1842605000, "accn": "0000845877-20-000029", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-25", "frame": "CY2017", "unit": "USD" }, { "start": "2016-01-01", "end": "2016-12-31", "val": -593409000, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2016", "unit": "USD" }, { "start": "2015-01-01", "end": "2015-12-31", "val": -1250533000, "accn": "0000845877-18-000017", "fy": 2017, "fp": "Q4", "form": "10-K", "filed": "2018-03-08", "frame": "CY2015", "unit": "USD" }, { "start": "2014-01-01", "end": "2014-12-31", "val": -83662000, "accn": "0000845877-17-000018", "fy": 2016, "fp": "Q4", "form": "10-K", "filed": "2017-03-09", "frame": "CY2014", "unit": "USD" }, { "start": "2013-01-01", "end": "2013-12-31", "val": -995093000, "accn": "0000845877-16-000187", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-10", "frame": "CY2013", "unit": "USD" }, { "start": "2012-01-01", "end": "2012-12-31", "val": -1328810000, "accn": "0000845877-15-000035", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-16", "frame": "CY2012", "unit": "USD" }, { "start": "2011-01-01", "end": "2011-12-31", "val": -2004814000, "accn": "0000845877-14-000026", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-13", "unit": "USD" }, { "start": "2010-12-31", "end": "2011-12-31", "val": -2004814000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2011", "unit": "USD" }, { "start": "2010-01-01", "end": "2010-12-31", "val": -1636249000, "accn": "0000845877-12-000009", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-15", "unit": "USD" }, { "start": "2009-12-31", "end": "2010-12-31", "val": -1636249000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2010", "unit": "USD" }, { "start": "2009-01-01", "end": "2009-12-31", "val": -639635000, "accn": "0000845877-12-000009", "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": "2025-12-31", "val": 1047347000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "unit": "USD" }, { "end": "2024-12-31", "val": 943239000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2024Q4I", "unit": "USD" }, { "end": "2023-12-31", "val": 823716000, "accn": "0000845877-25-000033", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-21", "frame": "CY2023Q4I", "unit": "USD" }, { "end": "2022-12-31", "val": 698530000, "accn": "0000845877-24-000028", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-23", "frame": "CY2022Q4I", "unit": "USD" }, { "end": "2021-12-31", "val": 588557000, "accn": "0000845877-23-000026", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-24", "frame": "CY2021Q4I", "unit": "USD" }, { "end": "2020-12-31", "val": 509560000, "accn": "0000845877-22-000022", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-28", "frame": "CY2020Q4I", "unit": "USD" }, { "end": "2019-12-31", "val": 457047000, "accn": "0000845877-21-000024", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-25", "frame": "CY2019Q4I", "unit": "USD" }, { "end": "2018-12-31", "val": 393351000, "accn": "0000845877-20-000029", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-25", "frame": "CY2018Q4I", "unit": "USD" }, { "end": "2017-12-31", "val": 322704000, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2017Q4I", "unit": "USD" }, { "end": "2016-12-31", "val": 275714000, "accn": "0000845877-18-000017", "fy": 2017, "fp": "Q4", "form": "10-K", "filed": "2018-03-08", "frame": "CY2016Q4I", "unit": "USD" }, { "end": "2015-12-31", "val": 231228000, "accn": "0000845877-17-000018", "fy": 2016, "fp": "Q4", "form": "10-K", "filed": "2017-03-09", "frame": "CY2015Q4I", "unit": "USD" }, { "end": "2014-12-31", "val": 201013000, "accn": "0000845877-16-000187", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-10", "frame": "CY2014Q4I", "unit": "USD" }, { "end": "2013-12-31", "val": 168877000, "accn": "0000845877-15-000035", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-16", "frame": "CY2013Q4I", "unit": "USD" }, { "end": "2012-12-31", "val": 102243000, "accn": "0000845877-14-000026", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-13", "unit": "USD" }, { "end": "2011-12-31", "val": 62554000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2011Q4I", "unit": "USD" }, { "end": "2010-12-31", "val": 50837000, "accn": "0000845877-12-000009", "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": "2025-01-01", "end": "2025-12-31", "val": 10911000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2025", "unit": "shares" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 10874000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2024", "unit": "shares" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 10829000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2023", "unit": "shares" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 10791000, "accn": "0000845877-25-000033", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-21", "frame": "CY2022", "unit": "shares" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 10758000, "accn": "0000845877-24-000028", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-23", "frame": "CY2021", "unit": "shares" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 10728000, "accn": "0000845877-23-000026", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-24", "frame": "CY2020", "unit": "shares" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 10696000, "accn": "0000845877-22-000022", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-28", "frame": "CY2019", "unit": "shares" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 10654000, "accn": "0000845877-21-000024", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-25", "frame": "CY2018", "unit": "shares" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 10594000, "accn": "0000845877-20-000029", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-25", "frame": "CY2017", "unit": "shares" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 10477000, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2016", "unit": "shares" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 10949000, "accn": "0000845877-18-000017", "fy": 2017, "fp": "Q4", "form": "10-K", "filed": "2018-03-08", "frame": "CY2015", "unit": "shares" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 10920000, "accn": "0000845877-17-000018", "fy": 2016, "fp": "Q4", "form": "10-K", "filed": "2017-03-09", "frame": "CY2014", "unit": "shares" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 10816000, "accn": "0000845877-16-000187", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-10", "frame": "CY2013", "unit": "shares" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 10479000, "accn": "0000845877-15-000035", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-16", "frame": "CY2012", "unit": "shares" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 10335000, "accn": "0000845877-14-000026", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-13", "unit": "shares" }, { "start": "2010-12-31", "end": "2011-12-31", "val": 10335000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2011", "unit": "shares" }, { "start": "2009-12-31", "end": "2010-12-31", "val": 10229000, "accn": "0000845877-13-000055", "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": "2025-01-01", "end": "2025-12-31", "val": 10983000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2025", "unit": "shares" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 10975000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2024", "unit": "shares" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 10937000, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2023", "unit": "shares" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 10883000, "accn": "0000845877-25-000033", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-21", "frame": "CY2022", "unit": "shares" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 10846000, "accn": "0000845877-24-000028", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-23", "frame": "CY2021", "unit": "shares" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 10786000, "accn": "0000845877-23-000026", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-24", "frame": "CY2020", "unit": "shares" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 10778000, "accn": "0000845877-22-000022", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-28", "frame": "CY2019", "unit": "shares" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 10746000, "accn": "0000845877-21-000024", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-25", "frame": "CY2018", "unit": "shares" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 10803000, "accn": "0000845877-20-000029", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-25", "frame": "CY2017", "unit": "shares" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 10746000, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2016", "unit": "shares" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 11309000, "accn": "0000845877-18-000017", "fy": 2017, "fp": "Q4", "form": "10-K", "filed": "2018-03-08", "frame": "CY2015", "unit": "shares" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 11367000, "accn": "0000845877-17-000018", "fy": 2016, "fp": "Q4", "form": "10-K", "filed": "2017-03-09", "frame": "CY2014", "unit": "shares" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 11209000, "accn": "0000845877-16-000187", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-10", "frame": "CY2013", "unit": "shares" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 11019000, "accn": "0000845877-15-000035", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-16", "frame": "CY2012", "unit": "shares" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 10802000, "accn": "0000845877-14-000026", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-13", "unit": "shares" }, { "start": "2010-12-31", "end": "2011-12-31", "val": 10802000, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2011", "unit": "shares" }, { "start": "2009-12-31", "end": "2010-12-31", "val": 10615000, "accn": "0000845877-13-000055", "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": "2025-01-01", "end": "2025-12-31", "val": 16.73, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2025", "unit": "USD/shares" }, { "start": "2024-01-01", "end": "2024-12-31", "val": 16.59, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2024", "unit": "USD/shares" }, { "start": "2023-01-01", "end": "2023-12-31", "val": 15.97, "accn": "0000845877-26-000014", "fy": 2025, "fp": "FY", "form": "10-K", "filed": "2026-02-19", "frame": "CY2023", "unit": "USD/shares" }, { "start": "2022-01-01", "end": "2022-12-31", "val": 14, "accn": "0000845877-25-000033", "fy": 2024, "fp": "FY", "form": "10-K", "filed": "2025-02-21", "frame": "CY2022", "unit": "USD/shares" }, { "start": "2021-01-01", "end": "2021-12-31", "val": 10.36, "accn": "0000845877-24-000028", "fy": 2023, "fp": "FY", "form": "10-K", "filed": "2024-02-23", "frame": "CY2021", "unit": "USD/shares" }, { "start": "2020-01-01", "end": "2020-12-31", "val": 8.85, "accn": "0000845877-23-000026", "fy": 2022, "fp": "FY", "form": "10-K", "filed": "2023-02-24", "frame": "CY2020", "unit": "USD/shares" }, { "start": "2019-01-01", "end": "2019-12-31", "val": 8.76, "accn": "0000845877-22-000022", "fy": 2021, "fp": "FY", "form": "10-K", "filed": "2022-02-28", "frame": "CY2019", "unit": "USD/shares" }, { "start": "2018-01-01", "end": "2018-12-31", "val": 8.91, "accn": "0000845877-21-000024", "fy": 2020, "fp": "FY", "form": "10-K", "filed": "2021-02-25", "frame": "CY2018", "unit": "USD/shares" }, { "start": "2017-01-01", "end": "2017-12-31", "val": 6.73, "accn": "0000845877-20-000029", "fy": 2019, "fp": "FY", "form": "10-K", "filed": "2020-02-25", "frame": "CY2017", "unit": "USD/shares" }, { "start": "2016-01-01", "end": "2016-12-31", "val": 6.12, "accn": "0000845877-19-000018", "fy": 2018, "fp": "Q4", "form": "10-K", "filed": "2019-02-21", "frame": "CY2016", "unit": "USD/shares" }, { "start": "2015-01-01", "end": "2015-12-31", "val": 4.33, "accn": "0000845877-18-000017", "fy": 2017, "fp": "Q4", "form": "10-K", "filed": "2018-03-08", "frame": "CY2015", "unit": "USD/shares" }, { "start": "2014-01-01", "end": "2014-12-31", "val": 3.5, "accn": "0000845877-17-000018", "fy": 2016, "fp": "Q4", "form": "10-K", "filed": "2017-03-09", "frame": "CY2014", "unit": "USD/shares" }, { "start": "2013-01-01", "end": "2013-12-31", "val": 6.64, "accn": "0000845877-16-000187", "fy": 2015, "fp": "FY", "form": "10-K", "filed": "2016-03-10", "frame": "CY2013", "unit": "USD/shares" }, { "start": "2012-01-01", "end": "2012-12-31", "val": 4.19, "accn": "0000845877-15-000035", "fy": 2014, "fp": "FY", "form": "10-K", "filed": "2015-03-16", "frame": "CY2012", "unit": "USD/shares" }, { "start": "2011-01-01", "end": "2011-12-31", "val": 1.33, "accn": "0000845877-14-000026", "fy": 2013, "fp": "FY", "form": "10-K", "filed": "2014-03-13", "unit": "USD/shares" }, { "start": "2010-12-31", "end": "2011-12-31", "val": 1.33, "accn": "0000845877-13-000055", "fy": 2012, "fp": "FY", "form": "10-K", "filed": "2013-03-18", "frame": "CY2011", "unit": "USD/shares" }, { "start": "2010-01-01", "end": "2010-12-31", "val": 2.16, "accn": "0000845877-12-000009", "fy": 2011, "fp": "FY", "form": "10-K", "filed": "2012-03-15", "unit": "USD/shares" }, { "start": "2009-12-31", "end": "2010-12-31", "val": 2.16, "accn": "0000845877-13-000055", "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": 8.12, "accn": "0000845877-12-000009", "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. 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