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Schedule II - Condensed Financial Information of Registrant (Parent Company Only) Schedule II - Condensed Financial Information of Registrant - Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 36 Months Ended 48 Months Ended
Sep. 30, 2018
Sep. 30, 2011
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2018
Operating Loss Carryforwards   $ 3,650,000 $ 3,423,704         $ 3,423,704
Tolling Payment Payable to AFG     44,381 $ 30,496     $ 30,496 44,381
Tolling Payment Payable to AFG, Gross     $ 13,885   $ 28,691     13,885
TierABCCredit $ 5,000         $ 5,000    
TierABCredit       $ (10,000)        
Minimum [Member]                
Operating Loss Carryforwards, Expiration Date     Dec. 31, 2029          
Maximum [Member]                
Operating Loss Carryforwards, Expiration Date     Dec. 31, 2032          
AFG [Member]                
Operating Loss Carryforwards     $ 1,260,583         1,260,583
Ambac Assurance [Member]                
Operating Loss Carryforwards     2,163,121         2,163,121
Percentage Of Notional Federal Tax Liability   25.00%            
AACNetTaxableIncome             1,486,879  
AACNetTaxableIncomeFromTierA         $ 479,000      
AACNetTaxableIncomeFromTierB             $ 1,007,879 1,007,879
Tier B [Member]                
Operating Loss Carryforwards   $ 1,057,000 $ 1,057,000         $ 1,057,000