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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | $ 1,367,154 |  | $ 1,291,054 |  | $ 1,337,272 | $ 1,272,253 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (4,858) |  | (2,700) |  | (35,532) | (2,300) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 123,808 | [1] | 107,670 | [1] | 379,476 | 257,671 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | (62,047) | [1] | (26,337) | [1] | 79,316 | 49,511 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (101,868) | [1] | (88,551) | [1] | 245,342 | 234,552 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 2,782 |  | 3,844 |  | 9,948 | 35,042 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | (69,119) |  | (12,973) |  | 106,847 | 12,973 |
Fair Value, end of period |  | 1,255,935 |  | 1,272,020 |  | 1,255,935 | 1,272,020 |
Corporate Debt Securities [Member] | Investment Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | (156) |  | (383) |  | (822) | (1,202) |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | (180) |  | (394) |  | (845) | (1,213) |
Corporate Debt Securities [Member] | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 239 |  | 396 |  | (2,902) | 7,592 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | (1,430) |  |  |  | (4,571) | (2,788) |
Canadian Provincial Governments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 572,698 |  | 533,270 |  | 593,942 | 475,965 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (27,476) |  | (11,365) |  | (55,632) | 39,669 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 0 | [1] | 0 | [1] | 0 | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 0 | [1] | 0 | [1] | 0 | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 0 | [1] | 0 | [1] | 0 | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, end of period |  | 548,742 |  | 525,365 |  | 548,742 | 525,365 |
Canadian Provincial Governments [Member] | Investment Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 3,520 |  | 3,460 |  | 10,432 | 9,731 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 3,520 |  | 3,460 |  | 10,432 | 9,731 |
Canadian Provincial Governments [Member] | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  |  |  | 0 | 0 |
Residential mortgage-backed securities |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 54,839 |  | 148,685 |  | 107,882 | 160,291 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (1) |  | 104 |  | (1,782) | 2,716 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 0 | [1] | 26,765 | [1] | 45,328 | 72,582 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 0 | [1] | (3,553) | [1] | 4,961 | 18,624 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (3) | [1] | (3,645) | [1] | 4,538 | 15,084 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0 |  | 15 |  | 3,031 | 5,515 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | (54,838) |  | (50,390) |  | 145,140 | 89,621 |
Fair Value, end of period |  | 0 |  | 117,995 |  | 0 | 117,995 |
Residential mortgage-backed securities | Investment Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 3 |  | (30) |  | (132) | (304) |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | (27) |  | 0 | (155) |
Residential mortgage-backed securities | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  | 44 |  | 312 | 524 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  |  |  | 0 | (346) |
Asset-backed securities |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 70,686 |  | 201,589 |  | 123,474 | 219,280 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (130) |  | (101) |  | (821) | 6,802 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 11,099 | [1] | 0 | [1] | 22,099 | 45,215 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | (462) | [1] | 0 | [1] | 462 | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (24,166) | [1] | (15,243) | [1] | 46,449 | 60,966 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 64,009 |  | 36,994 |  | 68,977 | 75,752 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | (38,915) |  | (78,202) |  | 86,163 | 142,575 |
Fair Value, end of period |  | 82,767 |  | 145,197 |  | 82,767 | 145,197 |
Asset-backed securities | Investment Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 20 |  | 160 |  | 202 | 1,689 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 13 |  | 156 |  | 187 | 556 |
Asset-backed securities | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 626 |  | 0 |  | 1,910 | 0 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  |  |  | 0 | 0 |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 16,505 |  | 34,434 |  | 41,203 | 41,666 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (544) |  | (208) |  | 46 | (228) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 0 | [1] | 0 | [1] | 0 | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] |  |  |  |  |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (37) | [1] | 35 | [1] | 158 | 309 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 9,859 |  | 7,295 |  | 9,859 | 7,295 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | (12,144) |  | 0 |  | 37,309 | 6,844 |
Fair Value, end of period |  | 13,645 |  | 41,512 |  | 13,645 | 41,512 |
US States and Political Subdivisions Debt Securities [Member] | Investment Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 6 |  | 26 |  | 4 | (68) |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 6 |  | 26 |  | 3 | (68) |
US States and Political Subdivisions Debt Securities [Member] | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  |  |  |  |  | 0 |
Debt Security, Government, Non-US [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 5,044 |  |  |  | 5,092 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (32) |  |  |  | (80) |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 0 | [1] |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 0 | [1] |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0 |  |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | 0 |  |  |  | 0 |  |
Fair Value, end of period |  | 5,012 |  |  |  | 5,012 |  |
Debt Security, Government, Non-US [Member] | Investment Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  |  |  | 0 |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  |  |  | 0 |  |
Foreign Government Debt [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  |  |  | 11,994 |  |  | 12,869 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  |  | (7) |  |  | (210) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] |  |  | 495 |  |  | 495 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] |  |  |  |  |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | [1] |  |  | 0 |  |  | 672 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |  |  | 0 |  |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  |  | 6,853 |  |  | 6,853 |
Fair Value, end of period |  |  |  | 5,628 |  |  | 5,628 |
Foreign Government Debt [Member] | Investment Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  |  | (1) |  |  | (1) |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  |  |  | (1) |  |  | (1) |
Foreign Government Debt [Member] | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  |  |  |  |  | 0 |
US Government Agencies Debt Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 20,735 |  | 23,567 |  | 22,511 | 24,488 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (122) |  | 6 |  | (635) | 269 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 120 | [1] | 134 | [1] | 334 | 370 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] |  |  |  |  |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (374) | [1] | 340 | [1] | 1,634 | 1,528 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  |  | 0 |  | 0 | 0 |
Fair Value, end of period |  | 20,252 |  | 23,251 |  | 20,252 | 23,251 |
US Government Agencies Debt Securities [Member] | Investment Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | (107) |  | (116) |  | (324) | (348) |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | (107) |  | (116) |  | (325) | (348) |
US Government Agencies Debt Securities [Member] | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  |  |  |  |  | 0 |
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 1,867 |  | 1,943 |  | 3,234 | 21,145 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 7 |  | 5 |  | (56) | (57) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 0 | [1] | 0 | [1] | 0 | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] |  |  |  |  |  | 3,720 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | (1) | [1] | 1 | [1] | 4 | 5,403 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 1,752 |  | 0 |  | 1,752 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | (1,843) |  | 0 |  | 3,144 | 10,132 |
Fair Value, end of period |  | 1,782 |  | 1,947 |  | 1,782 | 1,947 |
Commercial Mortgage Backed Securities [Member] | Investment Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 709 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 | 0 |
Commercial Mortgage Backed Securities [Member] | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  |  |  |  |  | (595) |
ERROR in label resolution. |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | 0 |  |  |  |  |  |
Funds Withheld At Interest Embedded Derivatives [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 144,610 |  | 61,281 |  | 122,194 | (22,529) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] | 0 |  | 0 |  | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] | 0 |  |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | [1] | 0 |  | 0 |  | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |  |  |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, end of period |  | 142,529 |  | 84,325 |  | 142,529 | 84,325 |
Funds Withheld At Interest Embedded Derivatives [Member] | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | (2,081) |  | 23,044 |  | 20,335 | 106,854 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | (2,081) |  | 23,044 |  | 20,335 | 106,854 |
Funds Withheld At Interest Embedded Derivatives [Member] | Interest Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 | 0 |
Funds Withheld At Interest Embedded Derivatives [Member] | Other Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 | 0 |
Longevity Swap [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 43,971 |  | 33,349 |  | 40,659 | 26,958 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (307) |  | 1,144 |  | (1,552) | 3,689 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] | 0 |  | 0 |  | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] | 0 |  |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | [1] | 0 |  | 0 |  | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |  |  |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, end of period |  | 46,090 |  | 37,827 |  | 46,090 | 37,827 |
Longevity Swap [Member] | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 | 0 |
Longevity Swap [Member] | Interest Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 | 0 |
Longevity Swap [Member] | Other Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 2,426 |  | 3,334 |  | 6,983 | 7,180 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 2,426 |  | 3,334 |  | 6,983 | 7,180 |
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales | [1] | 0 |  |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 |  |  |  |  |  | 0 |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | (928,797) |  | (974,631) |  | (1,014,228) | (990,308) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases | [1] | (4,231) |  | (18,736) |  | (16,946) | (51,276) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements | [1] | 20,044 |  | 21,809 |  | 56,210 | 63,047 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, end of period |  | (906,199) |  | (989,940) |  | (906,199) | (989,940) |
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | (32,133) |  | 10,047 |  | (62,242) | (9,005) |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | (30,433) |  | 11,900 |  | (56,808) | (2,934) |
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Interest Income [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | (25,348) |  | (8,335) |  | 6,523 | (20,408) |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 45,393 |  | 30,145 |  | 49,688 | 83,456 |
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Other Income [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 | 0 |
Mortality Swap [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales | [1] | 0 |  |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 |  |  |  |  |  | 0 |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 782 |  | 1,552 |  | 1,683 | 2,462 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 1 |  | 1 |  | 1 | 1 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases | [1] | 0 |  | 0 |  | 0 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements | [1] | 0 |  | 0 |  | 1,700 | 1,700 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, end of period |  | (308) |  | (1,683) |  | (308) | (1,683) |
Mortality Swap [Member] | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 | 0 |
Mortality Swap [Member] | Interest Income [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 | 0 |
Mortality Swap [Member] | Other Income [Member] |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings |  | (473) |  | 132 |  | 326 | 922 |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | (473) |  | 132 |  | (326) | 922 |
Equity securities |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 42,937 |  |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 |  |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 863 |  |  |  | 13,111 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 5,847 |  |  |  | 6,416 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 0 |  |  |  | 48 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |  |  |  |  | 38,905 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | 0 |  |  |  | 0 |  |
Fair Value, end of period |  | 43,485 |  |  |  | 43,485 |  |
Equity securities | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 5,532 |  |  |  | (2,067) |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 2,178 |  |  |  | (5,527) |  |
Equity securities | Interest Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  |  |  | 0 |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  |  |  | 0 |  |
Equity securities | Other Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  |  |  | 0 |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  |  |  | 0 |  |
ERROR in label resolution. |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 3,217 |  | 3,548 |  | 3,096 | 3,346 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 47 |  | (3) |  | 1 | 1 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  | 1,721 | [1] | 3,164 | [1] | 2,202 | 3,520 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 0 | [1] |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  | 0 | [1] | (114) | [1] | 314 | (272) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |  |  |  |  | 0 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | 2,782 |  | 3,236 |  | 2,782 | 3,236 |
Fair Value, end of period |  | 2,203 |  | 3,359 |  | 2,203 | 3,359 |
ERROR in label resolution. | Gain (Loss) on Investments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 | 0 |
ERROR in label resolution. | Interest Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | 0 |  | 0 |  | 0 | 0 |
ERROR in label resolution. | Other Income [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  | 0 |  | 0 |  | 0 | 0 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  | $ 0 |  | $ 0 |  | $ 0 | $ 0 |
[1] | The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

X
- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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