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)