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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) - Condensed Statements of Stockholders' Equity (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Total comprehensive income (loss), net of income tax | $ (584,478) | $ 97,748 | $ 211,666 |
Stock-based compensation | (9,356) | (12,266) | (11,231) |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | (701) | (4,665) | (3,568) |
Ending balance | 1,054,661 | 1,414,614 | 1,305,250 |
Stockholders' Equity Attributable to Parent | 856,906 | 1,361,656 |  |
Noncontrolling Interest, Change in Redemption Value | 49,966 | 4,836 | 2,504 |
Treasury Stock, Value, Acquired, Cost Method | 11,699 | 4,510 | 14,217 |
Issuance of common stock | 29,229 |  | 2 |
Purchase of Ambac Assurance auction market preferred shares |  |  | (7,919) |
Retained Earnings [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Total comprehensive income (loss), net of income tax | (556,449) | 3,632 | 521,248 |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | (634) | (7,872) | (5,446) |
Ending balance | 742,185 | 1,246,048 | 1,245,491 |
Noncontrolling Interest, Change in Redemption Value | 53,220 | 4,797 | 2,504 |
Purchase of Ambac Assurance auction market preferred shares |  |  | 1,131 |
AOCI Attributable to Parent [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Total comprehensive income (loss), net of income tax | (28,390) | 92,796 | (310,454) |
Ending balance | (188,436) | (160,047) | (252,843) |
Preferred Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Ending balance | 0 | 0 | 0 |
Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Ending balance | 489 | 467 | 467 |
Issuance of common stock | 22 |  | 2 |
Additional Paid-in Capital [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Ending balance | 331,007 | 291,761 | 274,486 |
Noncontrolling Interest, Change in Redemption Value | 1,044 |  |  |
Issuance of common stock | 29,207 |  |  |
Noncontrolling Interest [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Ending balance | 197,755 | 52,958 | 52,919 |
Noncontrolling Interest, Change in Redemption Value | (4,298) | 39 |  |
Purchase of Ambac Assurance auction market preferred shares |  |  | (9,050) |
Treasury Stock, Common |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | (67) | 3,207 | 1,878 |
Ending balance | (28,339) | (16,573) | (15,270) |
Treasury Stock, Value, Acquired, Cost Method | 11,699 | (4,510) | (14,217) |
Parent Company [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Total comprehensive income (loss), net of income tax | (584,839) | 96,430 | 210,794 |
Stock-based compensation | (8,995) | (17,275) | (17,408) |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | (701) | (4,665) | (3,568) |
Stockholders' Equity Attributable to Parent | 856,906 | 1,361,658 | 1,252,331 | $ 1,038,105
Noncontrolling Interest, Change in Redemption Value | 54,264 | 4,797 | 2,504 |
Payments for Repurchase of Warrants |  |  | 172 |
Treasury Stock, Value, Acquired, Cost Method | (11,699) | (4,510) | (14,217) |
Issuance of common stock | 29,229 |  | 2 |
Purchase of Ambac Assurance auction market preferred shares |  |  | 1,131 |
Parent Company [Member] | Retained Earnings [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Total comprehensive income (loss), net of income tax | (556,449) | 3,633 | 521,248 |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | (634) | (7,872) | (5,446) |
Stockholders' Equity Attributable to Parent | 742,185 | 1,246,048 | 1,245,491 | 726,054
Noncontrolling Interest, Change in Redemption Value | 53,220 | 4,797 | 2,504 |
Purchase of Ambac Assurance auction market preferred shares |  |  | 1,131 |
Parent Company [Member] | AOCI Attributable to Parent [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Total comprehensive income (loss), net of income tax | (28,390) | 92,797 | (310,454) |
Stockholders' Equity Attributable to Parent | (188,436) | (160,046) | (252,843) | 57,611
Parent Company [Member] | Preferred Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' Equity Attributable to Parent | 0 | 0 | 0 | 0
Parent Company [Member] | Common Stock [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders' Equity Attributable to Parent | 489 | 467 | 467 | 465
Issuance of common stock | 22 |  | 2 |
Parent Company [Member] | Additional Paid-in Capital [Member] |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stock-based compensation | (8,995) | (17,275) | (17,408) |
Stockholders' Equity Attributable to Parent | 331,007 | 291,761 | 274,486 | 256,906
Noncontrolling Interest, Change in Redemption Value | 1,044 |  |  |
Payments for Repurchase of Warrants |  |  | 172 |
Issuance of common stock | 29,207 |  |  |
Parent Company [Member] | Treasury Stock, Common |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture | (67) | 3,207 | 1,878 |
Stockholders' Equity Attributable to Parent | (28,339) | (16,573) | (15,270) | $ (2,931)
Treasury Stock, Value, Acquired, Cost Method | $ (11,699) | $ (4,510) | $ (14,217) |

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