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Business and Basis of Presentation Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2025
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2023
Derivative [Line Items]                  
Stockholders' Equity Attributable to Noncontrolling Interest $ 168,522   $ 168,522   $ 197,755        
Preferred Stock, Shares Issued 0   0   0        
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 190,347 $ 17,079 $ 190,347 $ 17,079 $ 140,860   $ 185,417 $ 17,079 $ 17,079
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest     (741) 916          
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders     (919) (1,047)          
Redeemable Noncontrolling Interest, Equity, Redemption Value 190,347   190,347            
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest 254 (213) (1,400) (914)          
Noncontrolling Interest, Change in Redemption Value (1,241) (184) (2,148) (131)          
Temporary Equity, Accretion to Redemption Value, Adjustment     2,148 131          
Disposal Group, Including Discontinued Operation, Net Assets Held-For Sale 6,592,417   6,592,417            
Disposal Group, Including Discontinued Operation, Assets 6,636,855 7,099,591 6,636,855 7,099,591   $ 6,267,200      
Disposal Group, Including Discontinued Operation, Liabilities 6,213,024   6,213,024     $ 5,887,685      
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent (52,151) 14,182 $ (82,398) 38,322          
Short Term Debt Duration Fee     1.00%            
Shor term debt extension fee     1.00%            
Short term debt minimum cash balance required     $ 30,000            
Repayments of Debt, Maturing in More than Three Months     10,000            
Put / call option exercise     (1,815)            
Payment for Put/Call Option     1,068            
Payments to Noncontrolling Interests $ 2,967   $ (4,036)            
SOFR + Credit Agreement | Secured Overnight Financing Rate (SOFR)                  
Derivative [Line Items]                  
Debt Instrument, Interest Rate, Stated Percentage 7.50%   7.50%            
Discontinued Operations, Held-for-Sale or Disposed of by Sale | Ambac Assurance Corporation [Member]                  
Derivative [Line Items]                  
Disposal Group, Including Discontinued Operation, Consideration, Fair Value, Net $ 402,239   $ 402,239   399,727        
Disposal Group, Including Discontinued Operation, Estimated Closing Costs 7,535   7,535   7,235        
Disposal Group, Including Discontinued Operation, Consideration, Fair Value, Net, After Allowance For Closing Costs 394,704   394,704   392,492        
Disposal Group, Including Discontinued Operation, Net Assets Held-For Sale 1,032,305   1,032,305   962,637        
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax     637,601   570,145        
Disposal Group, Including Discontinued Operation, Investment 2,321,619   2,321,619   2,226,505        
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents 13,023   13,023   8,322        
Disposal Group, Including Discontinued Operation, Premiums Receivable, Net 218,780   218,780   217,096        
Disposal Group, Including Discontinued Operation, Reinsurance Recoverable For Paid And Unpaid Claims And Claims Adjustments 26,359   26,359   25,274        
Disposal Group, Including Discontinued Operation, Prepaid Reinsurance Premiums 74,180   74,180   79,074        
Disposal Group, Including Discontinued Operation, Subrogation Recoverable 110,838   110,838   113,962        
Disposal Group, Including Discontinued Operation, Intangible Assets 208,424   208,424   213,457        
Disposal Group, Including Discontinued Operation, Other Assets 71,572   71,572   49,396        
Disposal Group, Including Discontinued Operation, Variable Interest Entity Assets 4,185,223   4,185,223   3,904,259        
Disposal Group, Including Discontinued Operation, Valuation Allowance On Assets Held-For-Sale (637,601)   (637,601)   (570,145)        
Disposal Group, Including Discontinued Operation, Assets 6,592,417   6,592,417   6,267,200        
Disposal Group, Including Discontinued Operation, Unearned Premiums 227,968   227,968   228,177        
Disposal Group, Including Discontinued Operation, Liability for Claims and Claims Adjustment Expense 600,916   600,916   577,167        
Disposal Group, Including Discontinued Operation, Reinsurance Payable 54,712   54,712   56,404        
Disposal Group, Including Discontinued Operation, Liabilities, Long-Term Debt And Accrued Interest 1,078,551   1,078,551   1,046,658        
Disposal Group, Including Discontinued Operation, Other Liabilities 105,346   105,346   105,772        
Disposal Group, Including Discontinued Operation, Variable Interest Entity Liabilities 4,145,531   4,145,531   3,873,507        
Disposal Group, Including Discontinued Operation, Liabilities 6,213,024   6,213,024   5,887,685        
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, Restricted Cash 57,754   57,754   $ 246,031        
Disposal Group, Including Discontinued Operation, Reclassification From AOCI At Closing $ (86,828)   (86,828)            
Retained Earnings [Member]                  
Derivative [Line Items]                  
Noncontrolling Interest, Change in Redemption Value     $ (12,424) $ (139)