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Segment Reporting - Adjusted Pretax Operating Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Net gains (losses) on investments and other financial instruments | $ (10,114) | $ 10,241 | $ (80,733)
Pretax income | 771,290 | 767,487 | 952,779
Operating Segments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Mortgage insurance adjusted pretax operating income | 827,363 | 829,824 | 1,131,943
Corporate, Non-Segment |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
All Other adjusted pretax operating income (loss) | (24,358) | (43,397) | (79,226)
Net gains (losses) on investments and other financial instruments | (5,798) | 814 | 47
Segment Reconciling Items |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Net gains (losses) on investments and other financial instruments | (4,316) | 9,427 | (80,780)
Amortization and impairment of goodwill and other acquired intangible assets | 0 | (15,285) | (4,308)
Impairment of other long-lived assets and other non-operating items | (27,399) | (13,082) | (14,850)
Mortgage Insurance revenues | Operating Segments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Mortgage insurance adjusted pretax operating income | 827,363 | 829,824 | 1,131,943
Net gains (losses) on investments and other financial instruments | $ 0 | $ 0 | $ 0

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- Definition This concept represents the gains and losses on investments and other financial instruments for the period excluding the impact of changes in the present value of insurance claims and recoveries on insured credit derivatives and VIEs, based on the company's ongoing insurance loss monitoring, which are a component of segment expenses. Also includes other than temporarily impaired losses recognized in earnings. + References No definition available. + Details
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