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Insurance Contracts - Additional Information (Details)
$ in Thousands, € in Millions, £ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2022
GBP (£)
Jun. 30, 2022
EUR (€)
Mar. 31, 2022
USD ($)
Jun. 30, 2021
GBP (£)
Jun. 30, 2021
EUR (€)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Insurance [Line Items]                        
Reinsurance Recoverable Credit Exposure $ 34,000   $ 34,000   $ 31,000              
Reinsurance Recoverable, Allowance for Credit Loss 48   48   10              
Public Finance Puerto Rico Net Par Outstanding 467,000   467,000                  
Schedule Of Insured Financial Obligations With Credit Deterioration Reductions Of Gross Claim Liability Rmbs Subrogation 1,484,000   1,484,000   1,730,000              
Financial Guarantee Insurance Contracts, Premium Receivable $ 288,000 $ 344,000 $ 288,000 $ 344,000 $ 320,000             $ 370,000
Estimated Future Premium Payments Weighted Average Discounted Rate 2.80%   2.80%   2.20% 2.80% 2.80%          
Reinsurance Payable $ 44,000   $ 44,000   $ 33,000              
Weighted average period of future premiums     8 years 2 months 12 days   8 years              
Uncollectable premium receivables 6,000   $ 6,000   $ 9,000              
Accelerated premium revenue for retired obligations 2,344 91 6,267 1,039                
Reinsurance recoveries of losses included in losses and loss expenses     (14,000) 2,000                
Subrogation recoveries, net of reinsurance (1,462,000)   (1,462,000)   (1,704,000)              
Amortization of intangible assets 13,000 14,000 28,000 33,000                
Intangible assets 330,000   330,000   362,000              
Possible Increase in Loss Reserves Related to Puerto Rico 195,000   195,000                  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 846,000 1,123,000 846,000 1,123,000 $ 1,098,000     $ 974,000     $ 1,123,000 $ 1,140,000
Stockholders Equity After Possible Increase in Domestic Public Finance Loss Reserves 651,000   651,000                  
Stockholders Equity After Possible Inability to Realize R&W Subrogation Recoveries (616,000)   (616,000)                  
Uncollateralized Credit Exposure Supported by Unlimited Uncapped Indemnity 29,000   29,000                  
Past Due Premiums 0 0 $ 0 0                
Loss Reserves [Member]                        
Insurance [Line Items]                        
Weighted average risk-free rate used to discount loss reserves     3.00%   1.20%              
United Kingdom, Pounds                        
Insurance [Line Items]                        
Financial Guarantee Insurance Contracts, Premium Receivable 91,000 122,000 $ 91,000 122,000   £ 74     £ 88      
Euro Member Countries, Euro                        
Insurance [Line Items]                        
Financial Guarantee Insurance Contracts, Premium Receivable $ 15,000 $ 16,000 $ 15,000 $ 16,000     € 14     € 13