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Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details) $ in Thousands | Jun. 30, 2019 USD ($) Entity | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) Entity | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | $ 3,460,894 |  |  |  |
Restricted Cash | 0 | $ 0 | $ 19,405 |  | $ 0
Derivative assets | 72,376 |  | 59,468 |  |
Other assets | 190,566 |  | 137,628 |  |
Total assets | 14,713,066 |  | 14,588,711 |  |
Interest Payable | 407,096 |  | 375,808 |  |
Long-term debt | 2,946,620 |  | 2,928,929 |  |
Derivative Liability | 88,245 |  | 76,699 |  |
Other Liabilities | 137,757 |  | 63,792 |  |
Liabilities | 13,160,150 |  | 12,955,564 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 3,138,714 |  | 2,737,286 |  |
Restricted Cash | 28,500 |  | 999 | $ 1,052 |
Financing Receivable, after Allowance for Credit Loss | 4,288,572 |  | 4,287,664 |  |
Derivative assets | 62,941 |  | 66,302 |  |
Other assets | 4,790 |  | 1,058 |  |
Total assets | 7,523,517 |  | 7,093,309 |  |
Interest Payable | 529 |  | 556 |  |
Long-term debt | 5,308,724 |  | 5,268,596 |  |
Long-term Debt, at par less amortized discount | 339,359 |  | 0 |  |
Long-term debt | 5,648,083 |  | 5,268,596 |  |
Derivative Liability | 1,818,273 |  | 1,712,062 |  |
Other Liabilities | 22 |  | 30 |  |
Liabilities | 7,466,907 |  | 6,981,244 |  |
Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 2,881,889 |  | 2,737,286 |  |
Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 256,825 |  | 0 |  |
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 2,881,889 |  | 2,737,286 |  |
Restricted Cash | 983 |  | 999 |  |
Financing Receivable, after Allowance for Credit Loss | 4,288,572 |  | 4,287,664 |  |
Derivative assets | 62,941 |  | 66,302 |  |
Other assets | 1,052 |  | 1,058 |  |
Total assets | 7,235,437 |  | 7,093,309 |  |
Interest Payable | 529 |  | 556 |  |
Long-term debt | 5,308,724 |  | 5,268,596 |  |
Long-term Debt, at par less amortized discount | 0 |  | 0 |  |
Long-term debt | 5,308,724 |  | 5,268,596 |  |
Derivative Liability | 1,818,273 |  | 1,712,062 |  |
Other Liabilities | 22 |  | 30 |  |
Liabilities | 7,127,548 |  | 6,981,244 |  |
Ambac UK [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 2,881,889 |  | 2,737,286 |  |
Ambac UK [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 |  | 0 |  |
Ambac Assurance [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 256,825 |  | 0 |  |
Restricted Cash | 27,517 |  | 0 |  |
Financing Receivable, after Allowance for Credit Loss | 0 |  | 0 |  |
Derivative assets | 0 |  | 0 |  |
Other assets | 3,738 |  | 0 |  |
Total assets | 288,080 |  | 0 |  |
Interest Payable | 0 |  | 0 |  |
Long-term debt | 0 |  | 0 |  |
Long-term Debt, at par less amortized discount | 339,359 |  | 0 |  |
Long-term debt | 339,359 |  | 0 |  |
Derivative Liability | 0 |  | 0 |  |
Other Liabilities | 0 |  | 0 |  |
Liabilities | 339,359 |  | 0 |  |
Ambac Assurance [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | 0 |  | 0 |  |
Ambac Assurance [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Fixed income securities, at fair value (amortized cost of $2,465,967 and $3,020,744) | $ 256,825 |  | $ 0 |  |
Consolidated Entities [Member] |  |  |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 8 |  | 7 |  |
Consolidated Entities [Member] | Ambac UK [Member] |  |  |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 7 |  | 7 |  |
Consolidated Entities [Member] | Ambac Assurance [Member] |  |  |  |  |
Number Of Consolidated Variable Interest Entities | Entity | 1 |  | 0 |  |

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