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Income Taxes Income Taxes - NOL Usage Table (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2019
Sep. 30, 2011
Dec. 31, 2018
Dec. 31, 2017
Net Income Loss Reconciliation [Line Items]        
Tolling Payment Payable to AFG Generated in Prior Years $ 44,381     $ 27,868
Tolling Payment Payable to AFG, Gross     $ 13,885  
NOL allocated amount   $ 3,650,000    
Tier C Tolling Payments Payable to IRS 12.50%      
Tier D Tolling Payments Payable to IRS 17.50%      
Current Year Loss Attributed to Tier B $ 80,197      
Ambac Assurance [Member]        
Net Income Loss Reconciliation [Line Items]        
AACNetTaxableIncome 89,326      
NOL allocated amount 2,252,447      
Afg [Member]        
Net Income Loss Reconciliation [Line Items]        
NOL allocated amount $ 1,251,453      
Tier A [Member]        
Net Income Loss Reconciliation [Line Items]        
NOL allocated amount   $ 479,000    
NOL applicable percentage   15.00%    
Tier B [Member]        
Net Income Loss Reconciliation [Line Items]        
NOL allocated amount   $ 1,057,000    
NOL applicable percentage   40.00%    
Tier C [Member]        
Net Income Loss Reconciliation [Line Items]        
NOL allocated amount   $ 1,057,000    
NOL applicable percentage   10.00%    
Tier D [Member]        
Net Income Loss Reconciliation [Line Items]        
NOL allocated amount   $ 1,057,000    
NOL applicable percentage   15.00%    
Minimum [Member]        
Net Income Loss Reconciliation [Line Items]        
Operating Loss Carryforwards, Expiration Date Dec. 31, 2029      
Maximum [Member]        
Net Income Loss Reconciliation [Line Items]        
Operating Loss Carryforwards, Expiration Date Dec. 31, 2032