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Income Taxes Income Taxes - NOL Usage Table (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 24 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Sep. 30, 2011 | Dec. 31, 2016 | Dec. 31, 2015
Net Income Loss Reconciliation [Line Items] |  |  |  |  |
Income Tax Examination, Penalties and Interest Accrued |  |  | $ 3,650,000 |  |
Post Determination Net Operating Loss | $ (32,084) |  |  |  |
TierABCCredit | 5,000 |  |  |  |
TierABCredit | 10,000 |  |  |  |
NOL allocated amount | 4,057,680 |  |  |  |
Tolling Payment to AFG |  |  |  | $ 100,145 | $ 71,454
Ambac Assurance [Member] |  |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |  |
Percentage Of Notional Federal Tax Liability |  |  | 25.00% |  |
AACNetTaxableIncome |  | $ 1,086,124 |  |  |
NOL allocated amount | 2,595,960 |  |  |  |
AACNetTaxableIncomeFromTierB |  |  |  | $ 607,124 |
AFG [Member] |  |  |  |  |
Net Income Loss Reconciliation [Line Items] |  |  |  |  |
Percentage Of Notional Federal Tax Liability |  |  | 50.00% |  |
NOL allocated amount | 1,389,646 |  |  |  |
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 | $ 3,985,606 |  |  |  |

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