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Income Taxes Income Taxes - NOL Usage Table (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2011 | Dec. 31, 2017
Net Income Loss Reconciliation [Line Items] |  |  |
Tolling Payment Payable to AFG | $ 14,129 |  | $ 30,496
NOL allocated amount |  | $ 3,650,000 |
Tier C Tolling Payments Payable to IRS | 12.50% |  |
Tier D Tolling Payments Payable to IRS | 17.50% |  |
Tier C Credit | $ (5,000) |  |
AAC Remaining Taxable Income From Tier C to Absorb Credit | 177,299 |  |
Ambac Assurance [Member] |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |
NOL allocated amount | 2,053,204 |  |
AACNetTaxableIncomeFromTierB | (229,001) |  |
AAC Remaining Taxable Income From Tier B | 168,205 |  |
AAC Net Taxable Income From Tier C | 238,095 |  |
Afg [Member] |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |
NOL allocated amount | 1,398,666 |  |
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% |
Domestic Tax Authority [Member] |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |
NOL allocated amount | $ 3,451,870 |  |
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 |  |

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