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Segment Reporting - Revenue and Other Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Net premiums earned | $ 951,283 | $ 919,578 | $ 981,131
Total services revenue | 50,270 | 46,092 | 92,216
Net investment income | 292,693 | 258,430 | 195,658
Net gains (losses) on investments and other financial instruments | (10,114) | 10,241 | (80,733)
Income (loss) on consolidated VIEs | (2) | 0 | 0
Other income | 6,153 | 6,247 | 2,454
Total revenues | 1,290,283 | 1,240,588 | 1,190,726
Provision for losses | (2,514) | (42,526) | (338,239)
Policy acquisition costs | 27,316 | 24,578 | 23,918
Allocated corporate operating expenses | 169,255 | 163,858 | 163,000
Interest expense | 108,014 | 89,695 | 84,454
Operating Segments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Adjusted pretax operating income | 827,363 | 829,824 | 1,131,943
All Other |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Net premiums earned | 12,046 | 10,215 | 23,918
Total services revenue | 49,646 | 45,394 | 85,158
Net investment income | 91,240 | 63,353 | 24,437
Net gains (losses) on investments and other financial instruments | (5,798) | 814 | 47
Income (loss) on consolidated VIEs | (2) |  |
Other income | 582 | 27 | 248
Total revenues | 147,714 | 119,803 | 133,808
Inter-segment |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Net premiums earned | 0 | 0 | 0
Total services revenue | (401) | (390) | (332)
Net investment income | 0 | 0 | 0
Net gains (losses) on investments and other financial instruments | 0 | 0 | 0
Income (loss) on consolidated VIEs | 0 |  |
Other income | (78) | (20) | (170)
Total revenues | (479) | (410) | (502)
Adjustments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Net premiums earned | 0 | 0 | 0
Total services revenue | 0 | 0 | 0
Net investment income | 0 | 0 | 0
Net gains (losses) on investments and other financial instruments | (4,316) | 9,427 | (80,780)
Income (loss) on consolidated VIEs | 0 |  |
Other income | 0 | 868 | 0
Total revenues | (4,316) | 10,295 | (80,780)
Mortgage insurance |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Provision for losses | (2,248) | (42,136) | (339,374)
Mortgage insurance | Operating Segments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Net premiums earned | 939,237 | 909,363 | 957,213
Total services revenue | 1,025 | 1,088 | 7,390
Net investment income | 201,453 | 195,077 | 171,221
Net gains (losses) on investments and other financial instruments | 0 | 0 | 0
Income (loss) on consolidated VIEs | 0 |  |
Other income | 5,649 | 5,372 | 2,376
Total revenues | 1,147,364 | 1,110,900 | 1,138,200
Provision for losses | (2,248) | (42,136) | (339,374)
Policy acquisition costs | 27,316 | 24,578 | 23,918
Direct other operating expenses | 66,417 | 71,150 | 92,756
Allocated corporate operating expenses | 144,251 | 140,583 | 138,566
Interest expense | 83,731 | 86,188 | 84,440
Other segment items | 534 | 713 | 5,951
Adjusted pretax operating income | 827,363 | 829,824 | 1,131,943
Direct depreciation expense | $ 7,974 | $ 8,164 | $ 8,986
Loss Ratio | (0.20%) | (4.60%) | (35.50%)
Expense Ratio | 25.30% | 26.00% | 26.70%

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