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Background and Business Description AMPS Exchange (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
shares
Aug. 03, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
Jun. 22, 2018
Dec. 31, 2017
USD ($)
shares
May 01, 2013
$ / shares
AMPS Exchange Surplus Notes Issued Per Share     $ 13,875        
AMPS Exchange Shares Tendered | shares     22,096        
AMPS Exchange Cash Paid Per Share     $ 500        
AMPS Exchange Warrants Issued Per Share     37.3076        
AMPS Exchange Percent Acquired     84.40%        
AMPS Exchange Shares Acquired | shares     22,296        
AMPS Exchange Aggregate Liquidation Preference     $ 557,400,000        
AMPS Exchange Total Surplus Notes Issued     212,740,000        
AMPS Exchange Interest Included in Surplus Notes Issued     $ 98,366,000        
AMPS Exchange Total Warrants Issued     824,307        
AMPS Exchange Nominal Discount     $ 227,000,000        
AMPS Exchange Nominal Discount at Fair Value     253,000,000        
AMPS Exchange Supporting Holder Percent of Total Outstanding         89.00%    
AMPS Exchange Supporting Holder Minimum Tender Commitment         80.00%    
AMPS Liquidation Preference Value Per Share     25,000        
Successor [Member]              
Preferred Stock, Shares Outstanding | shares 0 0       0  
Stockholders' Equity Attributable to Noncontrolling Interest $ 41,150,000 $ 41,150,000   $ 264,110,000   $ 264,110,000  
Warrants issued exercise price | $ / shares             $ 16.67
AMPS Exchange Total Cash Paid   11,048,000          
AMPS Exchange Loss Based on Carry Value 81,686,000 $ 81,686,000          
Ambac Assurance Corporation [Member]              
Preferred Stock, Shares Outstanding | shares           26,411  
Preferred Stock, Liquidation Preference, Value       $ 660,275,000      
Afg [Member]              
AMPS Exchange Aggregate Liquidation Preference     34,650,000        
AMPS Exchange Total Surplus Notes Issued     $ 19,440,000        
Ambac Assurance [Member] | Successor [Member]              
AMPS Exchange Loss Based on Carry Value $ 81,686,000