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Income Taxes Income Taxes - NOL Usage Table (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended | 87 Months Ended
--- | --- | --- | ---
Sep. 30, 2011 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Net Income Loss Reconciliation [Line Items] |  |  |  |  |
Impact of AMT Repeal on Current Taxes |  |  |  | $ 29,581 |
Change in Impact of AMT Repeal on Current Taxes |  |  | $ 1,902 |  |
AMT Related to Filing of 2017 Tax Return |  |  |  | 5,536 |
AMT Receivable Resulting from TCJA |  |  | $ 37,019 |  | $ 37,019
Impact of new Tax Law on Deferred Taxes |  |  |  | 31,418 |
Net Impact of New Tax Law |  |  |  | $ 1,886 |
AMT Installment Payment End Date |  |  | Dec. 31, 2021 |  |
AACNetTaxableIncome |  |  |  |  | $ 1,508,000
Operating Loss Generated in Current Year |  | $ 143,000 |  |  |
TierABCCredit |  | (5,000) |  |  |
TierABCredit |  | (10,000) |  |  |
NOL allocated amount | $ 3,650,000 | 3,535,000 |  |  |
Tolling Payment to AFG |  | 119,000 |  |  |
Tolling Payment Payable to AFG Outstanding Amount |  | 28,000 |  |  |
Tolling Payment Payable to AFG |  | 147,000 |  |  |
AACNetTaxableIncomeFromTierB |  | $ 1,029,000 |  |  |
Tier C Tolling Payment Payable to IRS |  | 12.50% |  |  |
Tier D Tolling Payments Payable to IRS |  | 17.50% |  |  |
Ambac Assurance [Member] |  |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |  |
NOL allocated amount |  | $ 2,285,000 |  |  |
Percentage Of Notional Federal Tax Liability | 25.00% |  |  |  |
AFG [Member] |  |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |  |
NOL allocated amount |  | 1,250,000 |  |  |
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 |  |  |
Minimum [Member] | Ambac Assurance [Member] |  |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2029 |  |  |
Minimum [Member] | AFG [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, 2040 |  |  |
Maximum [Member] | Ambac Assurance [Member] |  |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2040 |  |  |
Maximum [Member] | AFG [Member] |  |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Jan. 01, 2034 |  |  |

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