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Long-Term Debt (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2015 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Aug. 03, 2018 | Feb. 12, 2018 | May 01, 2013
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Tier 2 Note Security in RMBS Litigation Settlement Proceeds |  |  |  |  |  |  |  | $ 1,600,000 |
Secured Debt |  | $ 0 |  | $ 0 |  | $ 73,993 |  |  |
One Time Interest Payment on Surplus Notes |  |  |  |  |  |  |  | 13,501 |
Junior surplus note of Ambac Assurance Segregated Account |  |  |  |  |  |  |  |  | $ 350,000
5.1% Junior Surplus Notes, General Account Due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 19.50% |  | 19.50% |  |  |  |  |
Debt Instrument, Face Amount |  | $ 368,418 |  | $ 368,418 |  | 370,237 |  |  |
Ambac Note Post Exit From Rehabilitation [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 7.60% |  | 7.60% |  |  |  |  |
Debt Instrument, Face Amount |  | $ 2,040,894 |  | $ 2,040,894 |  |  |  |  |
Repayments of Debt |  | $ 113,457 |  |  |  |  |  |  |
Tier 2 Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.50% |  | 8.50% |  |  |  |  |
Tier 2 Note Security in RMBS Litigation Settlement Proceeds |  | $ 1,600,000 |  | $ 1,600,000 |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 9.90% |  | 9.90% |  |  |  |  |
Paid-in-Kind Interest |  |  |  | $ 7,936 |  |  |  |  |
Debt Instrument, Face Amount |  | $ 247,936 |  | 247,936 |  |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 0 |  | $ 0 |  | 73,993 |  |  |
5.1% Surplus Notes, General Account, Due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 10.40% |  | 10.40% |  |  |  |  |
Debt Instrument Principal Amount Subject To Repurchase |  |  |  |  |  |  |  | 463,624 |
Debt Instrument, Face Amount |  | $ 295,871 |  | $ 295,871 |  | 754,811 |  |  |
One State Street [Member] | 5.1% Junior Surplus Notes, General Account Due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument Principal Amount Subject To Repurchase |  | 3,436 |  | 3,436 |  |  |  |  |
Debt Instrument, Face Amount |  | $ 18,418 |  | 18,418 |  | 20,237 |  |  |
Extinguishment of Debt, Amount |  |  |  | $ 1,819 | $ 1,926 |  |  |  |
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] | 5.1% Junior Surplus Notes, Segregated Account Due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 8.40% |  | 8.40% |  |  |  |  |
Successor [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 2,796,389 |  | $ 2,796,389 |  | 991,696 |  |  |
Net realized gains (losses) on extinguishment of debt |  | 6 | $ 2,179 | 3,121 | $ 4,920 |  |  |  |
Successor [Member] | Ambac Assurance Corporation [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 2,796,389 |  | 2,796,389 |  | 991,696 |  |  |
Secured Debt |  | 0 |  | 0 |  | 73,993 |  |  |
Successor [Member] | Ambac Assurance Corporation [Member] | 5.1% Junior Surplus Notes, General Account Due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 249,428 |  | 249,428 |  | 249,036 |  |  |
Successor [Member] | Ambac Assurance Corporation [Member] | Ambac Note Post Exit From Rehabilitation [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 2,038,912 |  | 2,038,912 |  | 0 |  |  |
Successor [Member] | Ambac Assurance Corporation [Member] | Tier 2 Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | 239,736 |  | 239,736 |  | 0 |  |  |
Successor [Member] | Ambac Assurance Corporation [Member] | 5.1% Surplus Notes, General Account, Due 2020 [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  | $ 268,313 |  | $ 268,313 |  | 668,667 |  |  |
Successor [Member] | Variable Interest Entity [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 12,160,544 |  |  |
Successor [Member] | 5.1% Junior Surplus Notes, General Account Due 2020 [Member] | Ambac Assurance Corporation [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.10% |  | 5.10% |  | 5.10% |  |  |
Debt Instruments Maturity Year |  |  |  | 2020 |  | 2020 |  |  |
Successor [Member] | 5.1% Surplus Notes, General Account, Due 2020 [Member] | Ambac Assurance Corporation [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.10% |  | 5.10% |  | 5.10% |  |  |
Debt Instruments Maturity Year |  | 2020 |  | 2020 |  | 2020 |  |  |
Consolidated Variable Interest Entities [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unpaid Principal Amount Of Fixed Rate Debt Accounted For Under Fair Value Option |  | $ 9,095,639 |  | $ 9,095,639 |  | $ 9,387,884 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months |  | 152,889 |  | 152,889 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  | 263,780 |  | 263,780 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  | 130,239 |  | 130,239 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  | 0 |  | 0 |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five |  | $ 0 |  | $ 0 |  |  |  |  |
Consolidated Variable Interest Entities [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 1.07% |  | 1.07% |  | 0.96% |  |  |
Consolidated Variable Interest Entities [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 8.35% |  | 8.35% |  | 8.35% |  |  |
London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate on Ambac Note Post Exit From Rehabilitation |  |  |  | 5.00% |  |  |  |  |
Interest Rate on Securities Issued by Delaware Trust | 2.80% |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest Rate on Ambac Note Post Exit From Rehabilitation |  |  |  | 1.00% |  |  |  |  |
Ambac [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
One Time Interest Payment on Surplus Notes |  |  |  |  |  |  |  | $ 2,618 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
AMPS Exchange Total Surplus Notes Issued |  |  |  |  |  |  | $ 212,740 |  |

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