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Statement of Financial Position, Unclassified - Insurance Based Operations (Statement) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 04, 2024
Disposal Group, Including Discontinued Operation, Net Assets Held-For Sale $ 6,592,417   $ 6,592,417    
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent (52,151) $ 14,182 (82,398) $ 38,322  
Disposal Group, Including Discontinued Operation, Assets 6,636,855 7,099,591 6,636,855 7,099,591  
Disposal Group, Including Discontinued Operation, Liabilities 6,213,024   6,213,024    
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax (52,151) 14,182 (82,398) 38,322  
5.1% Surplus Notes Due 2020 | Ambac Assurance Corporation [Member]          
Debt Instrument, Interest Rate, Stated Percentage         5.10%
Discontinued Operations, Held-for-Sale or Disposed of by Sale | Ambac Assurance Corporation [Member]          
Disposal Group, Including Discontinued Operation, Consideration         $ 420,000
Disposal Group, Including Discontinued Operation, Consideration, Fair Value, Net, After Allowance For Closing Costs 394,704   394,704    
Disposal Group, Including Discontinued Operation, Consideration, Fair Value, Net 402,239   402,239    
Disposal Group, Including Discontinued Operation, Estimated Closing Costs 7,535   7,535    
Disposal Group, Including Discontinued Operation, Net Assets Held-For Sale 1,032,305   1,032,305    
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax     637,601    
Disposal Group, Including Discontinued Operation, Valuation Allowance On Assets Held-For-Sale (637,601)   (637,601)    
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 18.50
Warrants and Rights Outstanding, Term         6 years 6 months
Class Of Warrant Or Right, Number Of Securities Called By Warrants Or Rights, Percentage Of Fully Diluted Shares Of Common Stock         9.90%
Disposal Group, Including Discontinued Operation, Other Revenue (8,840) (15,995) (16,661) (21,435)  
Disposal Group, Including Discontinued Operation, Premiums Earned, Net (5,199) (5,569) (9,962) (13,055)  
Disposal Group, Including Discontinued Operation, Net Investment Income (36,107) (32,419) (56,807) (70,450)  
Disposal Group, Including Discontinued Operation, Realized Investment Gains (Losses) 12,514 956 18,468 388  
Disposal Group, Including Discontinued Operation, Derivative, Gain (Loss) On Derivative, Net 8,834 (461) 9,367 (1,994)  
Disposal Group, Including Discontinued Operation, Revenue (28,798) (53,488) (55,595) (106,546)  
Disposal Group, Including Discontinued Operation, Operating Expense (26,171) (36,788) (67,767) (61,080)  
Disposal Group, Including Discontinued Operation, Operating Income (Loss) (2,627) (16,700) 12,172 (45,466)  
Discontinued Operation, Tax Effect of Income (Loss) from Discontinued Operation During Phase-out Period (1,818) (2,518) (2,770) (7,144)  
Disposal Group, Including Discontinued Operation, Policyholder Benefits And Claims Incurred, Net 2,657 5,270 (8,078) 25,978  
Disposal Group, Including Discontinued Operation, Amortization (5,362) (7,014) (11,188) (18,341)  
Disposal Group, Including Discontinued Operation, General and Administrative Expense (7,523) (19,063) (16,607) (36,732)  
Disposal Group, Including Discontinued Operation, Interest Expense (15,943) (15,986) (31,894) (31,966)  
Disposal Group, Including Discontinued Operation, Other Expense 0 5 0 (19)  
Disposal Group, Including Discontinued Operation, Investment 2,321,619   2,321,619    
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents 13,023   13,023    
Disposal Group, Including Discontinued Operation, Premiums Receivable, Net 218,780   218,780    
Disposal Group, Including Discontinued Operation, Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments 26,359   26,359    
Disposal Group, Including Discontinued Operation, Prepaid Reinsurance Premiums 74,180   74,180    
Disposal Group, Including Discontinued Operation, Subrogation Recoverable 110,838   110,838    
Disposal Group, Including Discontinued Operation, Intangible Assets 208,424   208,424    
Disposal Group, Including Discontinued Operation, Other Assets 71,572   71,572    
Disposal Group, Including Discontinued Operation, Variable Interest Entity Assets 4,185,223   4,185,223    
Disposal Group, Including Discontinued Operation, Assets 6,592,417   6,592,417    
Disposal Group, Including Discontinued Operation, Unearned Premiums 227,968   227,968    
Disposal Group, Including Discontinued Operation, Liability for Claims and Claims Adjustment Expense 600,916   600,916    
Disposal Group, Including Discontinued Operation, Reinsurance Payable 54,712   54,712    
Disposal Group, Including Discontinued Operation, Liabilities, Long-Term Debt And Accrued Interest 1,078,551   1,078,551    
Disposal Group, Including Discontinued Operation, Other Liabilities 105,346   105,346    
Disposal Group, Including Discontinued Operation, Variable Interest Entity Liabilities 4,145,531   4,145,531    
Disposal Group, Including Discontinued Operation, Liabilities 6,213,024   6,213,024    
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax $ (52,960) $ 0 $ (67,456) $ 0