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Income Taxes Income Taxes - NOL Usage Table (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2016 | Sep. 30, 2011 | Dec. 31, 2015 | Jun. 30, 2016
Net Income Loss Reconciliation [Line Items] |  |  |  |
Income Tax Examination, Penalties and Interest Accrued | $ 3,650,000 |  |  | $ 3,650,000
Tolling Payment Payable to AFG | 1,120 |  | $ 70,911 | 1,120
TierABCCredit | 10,000 |  |  |
TierACreditUsage | 5,000 |  |  |
NOL allocated amount | 4,245,743 |  |  | 4,245,743
Ambac Assurance [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
Percentage Of Notional Federal Tax Liability |  | 25.00% |  |
AACNetTaxableIncome |  |  | 877,313 | 885,312
NOL allocated amount | 2,764,688 |  |  | 2,764,688
AACNetTaxableIncomeFromTierA |  |  | 479,000 |
AACNetTaxableIncomeFromTierB | 7,998 |  | 398,313 |
AFG [Member] |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |
Percentage Of Notional Federal Tax Liability |  | 50.00% |  |
NOL allocated amount | $ 1,387,903 |  |  | $ 1,387,903
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% |

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