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Insurance Regulatory Restrictions Additional Details (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Average Annual Rate Of Return 8.06% 7.87%
Prescribed Discount Rate Percentage 5.10%  
Quarterly Dividend Increase Limitation Percentage 15.00%  
Percentage Of Policy Holders Surplus 10.00%  
Minimum [Member]    
Settlement Agreement Annual Restricted Payment Amount $ 5,000  
Maximum [Member]    
Settlement Agreement Annual Restricted Payment Amount 7,500  
Ambac Assurance [Member]    
Statutory Accounting Practices, Statutory Capital and Surplus, Balance 624,795 $ 100,000
Statutory Accounting Practices Capital 1,015,676 268,353
Ambac Assurance [Member] | Prescribed Or Permitted Additional Accounting Practices [Member]    
Statutory Accounting Practices, Prescribed Practice, Amount 21,260 168,085
Segregated Account [Member]    
Statutory Accounting Practices, Statutory Capital and Surplus, Balance $ 387,633 239,280
Insurance Liabilities Not Assumed   $ 149,482