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Background and Business Description AMPS Exchange (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
Aug. 03, 2018
USD ($)
shares
May 01, 2013
$ / shares
AMPS Liquidation Preference Value Per Share   $ 25,000  
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  
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares     $ 16.67
AMPS Exchange Percent Acquired   0.844  
AMPS Exchange Shares Acquired | shares   22,296  
AMPS Exchange Aggregated Liquidation Preference   $ 557,400,000  
AMPS Exchange Nominal Discount   227,000,000  
AMPS Exchange Nominal Discount at Fair Value   253,000,000  
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 Cash Paid $ 11,048,000    
AMPS Exchange Loss Based on Carry Value $ 81,686,000    
AFG [Member]      
AMPS Exchange Aggregated Liquidation Preference   $ 34,650,000