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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Policyholder Benefits and Claims Incurred, Ceded $ (1,657) $ 20,348 $ (5,421)  
Liability for Unpaid Claims and Claims Adjustment Expense, Net (129,505) 4,073,144 $ 3,665,271 $ 2,814,754
Loss and loss expense reserves 1,826,078 4,745,015    
Subrogation recoverable (1,932,960) (631,213)    
Claim liability reported on Balance Sheet, before reinsurance (106,882) 4,113,802    
Unpaid Claims-Claims [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Loss and loss expense reserves 0 2,411,632    
Subrogation recoverable 0 615,391    
Claim liability reported on Balance Sheet, before reinsurance 0 3,027,023    
Unpaid Claims-Accrued Interest [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Loss and loss expense reserves 0 667,988    
Subrogation recoverable 0 171,755    
Claim liability reported on Balance Sheet, before reinsurance 0 839,743    
Present Value of Expected Net Cash Flows- Claims and Loss Expenses [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Loss and loss expense reserves 2,246,335 2,855,010    
Subrogation recoverable 175,694 102,171    
Claim liability reported on Balance Sheet, before reinsurance 2,422,029 2,957,181    
Present Value of Expected Net Cash Flows-Recoveries [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Loss and loss expense reserves (313,595) (1,054,113)    
Subrogation recoverable (2,108,654) (1,520,530)    
Claim liability reported on Balance Sheet, before reinsurance (2,422,249) (2,574,643)    
Unearned Premium Reserve [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Loss and loss expense reserves (106,662) (135,502)    
Subrogation recoverable 0 0    
Claim liability reported on Balance Sheet, before reinsurance $ (106,662) $ (135,502)