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Subsequent Events 2018 Balance Sheet Impact (Details) - Subsequent Event [Member] - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Feb. 12, 2018
Second Amended Plan of Rehab 2018 Expected Cash Outflow Impact | $ 1,353,560 |
Secured Notes Received by Ambac LSNI and Ambac Assurance |  | $ 768,464
Ambac Assurance Corporation [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Interest Rate on Ambac Note | 5.00% |
Ambac Assurance Corporation [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Interest Rate on Ambac Note | 1.00% |
Ambac [Member] | Ambac Assurance Corporation [Member] |  |
Debt Instrument, Maturity Date | Feb. 12, 2023 |
Tier 2 Notes [Member] | Ambac Assurance Corporation [Member] |  |
Debt Instrument, Maturity Date | Feb. 12, 2055 |
Debt Instrument, Interest Rate, Stated Percentage | 8.50% |
Redemption Price After 12/17/2020 Including Principal and Interest | 100.00% |
Tier 2 Notes [Member] | Ambac Assurance Corporation [Member] | Minimum [Member] |  |
Debt Instrument, Maturity Date | Dec. 17, 2020 |
Ambac Note [Domain] |  |
Long-term debt |  | $ 2,154,351

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