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Special Purpose Entities, Including Variable Interest Entities Special Purpose Entities, including Variable Interest Entities - Summary of Assets and Liabilities (Details) $ in Thousands | Mar. 31, 2019 USD ($) Entity | Dec. 31, 2018 USD ($) Entity | Mar. 31, 2018 USD ($)
--- | --- | --- | ---
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) | $ 3,611,947 |  |
Restricted Cash | 0 | $ 19,405 |
Derivative assets | 76,400 | 59,468 |
Other assets | 90,977 | 137,628 |
Total assets | 15,022,899 | 14,588,711 |
Interest Payable | 391,335 | 375,808 |
Long-term debt | 2,929,227 | 2,928,929 |
Derivative Liability | 86,534 | 76,699 |
Other Liabilities | 71,402 | 63,792 |
Liabilities | 13,357,011 | 12,955,564 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) | 3,128,995 | 2,737,286 |
Restricted Cash | 3,254 | 999 | $ 1,134
Loans Receivable, Net | 4,375,761 | 4,287,664 |
Derivative assets | 59,228 | 66,302 |
Other assets | 4,686 | 1,058 |
Total assets | 7,571,924 | 7,093,309 |
Interest Payable | 2,785 | 556 |
Long-term debt | 5,401,992 | 5,268,596 |
Long-term Debt, at par less amortized discount | 335,271 | 0 |
Long-term debt | 5,737,263 | 5,268,596 |
Derivative Liability | 1,781,903 | 1,712,062 |
Other Liabilities | 56 | 30 |
Liabilities | 7,522,007 | 6,981,244 |
Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) | 2,858,404 | 2,737,286 |
Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) | 270,591 | 0 |
Ambac UK [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) | 2,858,404 | 2,737,286 |
Restricted Cash | 1,056 | 999 |
Loans Receivable, Net | 4,375,761 | 4,287,664 |
Derivative assets | 59,228 | 66,302 |
Other assets | 3,320 | 1,058 |
Total assets | 7,297,769 | 7,093,309 |
Interest Payable | 2,785 | 556 |
Long-term debt | 5,401,992 | 5,268,596 |
Long-term Debt, at par less amortized discount | 0 | 0 |
Long-term debt | 5,401,992 | 5,268,596 |
Derivative Liability | 1,781,903 | 1,712,062 |
Other Liabilities | 56 | 30 |
Liabilities | 7,186,736 | 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 $2,480,532 and $3,020,744) | 2,858,404 | 2,737,286 |
Ambac UK [Member] | Municipal Bonds [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) | 0 | 0 |
Ambac Assurance [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,480,532 and $3,020,744) | 270,591 | 0 |
Restricted Cash | 2,198 | 0 |
Loans Receivable, Net | 0 | 0 |
Derivative assets | 0 | 0 |
Other assets | 1,366 | 0 |
Total assets | 274,155 | 0 |
Interest Payable | 0 | 0 |
Long-term debt | 0 | 0 |
Long-term Debt, at par less amortized discount | 335,271 | 0 |
Long-term debt | 335,271 | 0 |
Derivative Liability | 0 | 0 |
Other Liabilities | 0 | 0 |
Liabilities | 335,271 | 0 |
Ambac Assurance [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Fixed income securities, at fair value (amortized cost of $2,480,532 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 $2,480,532 and $3,020,744) | $ 270,591 | $ 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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