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Basis of Presentation and Significant Accounting Policies Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Aug. 03, 2018
Jun. 30, 2018
Dec. 31, 2015
May 01, 2013
Apr. 30, 2013
Finite-Lived Intangible Assets [Line Items]                  
Income Taxes Paid $ 34,980 $ 40,334 $ 21,437            
AMPS Exchange Carrying Value of Surplus Notes Issued         $ 187,220        
Decrease in long-term debt as a result of an exchange for investment securities $ 0 $ 55,426 $ 0            
Common Stock Voting Restrictions       10.00%          
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01             $ 0.01
Entity Incorporation, Date of Incorporation Apr. 29, 1991                
Preferred stock, shares authorized 20,000,000 20,000,000              
Preferred Stock, Par or Stated Value Per Share $ 0.01 $ 0.01              
Warrant Exercised During Period Shares 194 0 136            
Junior surplus note of Ambac Assurance Segregated Account               $ 350,000  
Common Stock Transfer Restrictions       5.00%          
Common Stock Additional Transfer Restrictions       5.00%          
Non Cash Impact of Rehabilitation Exit Transaction           $ 1,918,561      
Cash and cash equivalents $ 63,089 $ 623,703 $ 91,025            
Restricted Cash 19,405 0              
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 83,493 624,681 95,898       $ 41,566    
Minimum [Member] | Furniture and Fixtures [Member]                  
Finite-Lived Intangible Assets [Line Items]                  
Finite-Lived Intangible Asset, Useful Life 3 years                
Maximum [Member] | Furniture and Fixtures [Member]                  
Finite-Lived Intangible Assets [Line Items]                  
Finite-Lived Intangible Asset, Useful Life 5 years                
Long-term Debt [Member]                  
Finite-Lived Intangible Assets [Line Items]                  
Interest Paid, Including Capitalized Interest, Operating and Investing Activities $ 231,734 39,112 4,537            
Accounting Standards Update 2018-02 [Domain] | AOCI Attributable to Parent [Member]                  
Finite-Lived Intangible Assets [Line Items]                  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   (6,588)              
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member]                  
Finite-Lived Intangible Assets [Line Items]                  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (2,900)                
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]                  
Finite-Lived Intangible Assets [Line Items]                  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 2,900                
Operating Expense [Member] | Accounting Standards Update 2017-07 [Member]                  
Finite-Lived Intangible Assets [Line Items]                  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results   920 625            
Deferred Income Tax Charge [Member] | Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member]                  
Finite-Lived Intangible Assets [Line Items]                  
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 590                
Variable Interest Entity, Primary Beneficiary [Member]                  
Finite-Lived Intangible Assets [Line Items]                  
Restricted Cash $ 999 $ 978 $ 4,873