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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Components of Loss and Loss Expense Reserves and Subrogation Recoverable (Details) - Successor [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Policyholder Benefits and Claims Incurred, Ceded $ 20,348 $ (5,421) $ (47,085)  
Liability for Unpaid Claims and Claims Adjustment Expense, Net 4,073,144 3,665,271 $ 2,814,754 $ 3,698,378
Loss and loss expense reserves 4,745,015 4,380,769    
Subrogation recoverable (631,213) (684,731)    
Claim liability reported on Balance Sheet, before reinsurance 4,113,802 3,696,038    
Unpaid Claims-Claims [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Loss and loss expense reserves 2,411,632 2,411,105    
Subrogation recoverable 615,391 583,042    
Claim liability reported on Balance Sheet, before reinsurance 3,027,023 2,994,147    
Unpaid Claims-Accrued Interest [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Loss and loss expense reserves 667,988 529,703    
Subrogation recoverable 171,755 132,139    
Claim liability reported on Balance Sheet, before reinsurance 839,743 661,842    
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 2,855,010 2,681,198    
Subrogation recoverable 102,171 68,419    
Claim liability reported on Balance Sheet, before reinsurance 2,957,181 2,749,617    
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 (1,054,113) (1,098,096)    
Subrogation recoverable (1,520,530) (1,468,331)    
Claim liability reported on Balance Sheet, before reinsurance (2,574,643) (2,566,427)    
Unearned Premium Reserve [Member]        
Components of Loss and Loss Expense Reserves and Subrogation Recoverable [Line Items]        
Loss and loss expense reserves (135,502) (143,141)    
Subrogation recoverable 0 0    
Claim liability reported on Balance Sheet, before reinsurance $ (135,502) $ (143,141)