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Income Taxes Income Taxes - NOL Usage Table (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2016 | Sep. 30, 2011 | Dec. 31, 2015
Net Income Loss Reconciliation [Line Items] |  |  |
Income Tax Examination, Penalties and Interest Accrued |  | $ 3,650,000 |
Percentage Of Notional Federal Tax Liability |  | 25.00% |
Tolling Payment Payable to AFG | $ 70,911 |  |
TierABCCredit | 10,000 |  |
TierACreditUsage | 5,000 |  |
NOL allocated amount | 4,325,337 |  |
Ambac Assurance [Member] |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |
AACNetTaxableIncome | (83,530) |  | $ 877,313
NOL allocated amount | 2,772,677 |  |
AACNetTaxableIncomeFromTierA |  |  | 479,000
AACNetTaxableIncomeFromTierB |  |  | 398,313
AFG [Member] |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |
NOL allocated amount | 1,383,898 |  |
Tier B [Member] |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |
NOL allocated amount |  |  | $ 1,057,000
PrePostDetermination [Domain] | Ambac Assurance [Member] |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |
NOL allocated amount | $ 2,856,207 |  |

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