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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, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Corporate Debt Securities [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | $ 1,644,364 | $ 1,367,154 |  |  | $ 1,330,925 |  | $ 1,337,272 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 17,090 | (4,858) |  |  | 53,222 |  | (35,532) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] | 214,025 | 123,808 |  |  | 604,897 |  | 379,476 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] | (34,363) | (62,047) |  |  | (59,000) |  | (79,316) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | [1] | (63,216) | (101,868) |  |  | (166,865) |  | (245,342) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 27,042 | 2,782 |  |  | 43,083 |  | 9,948 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | 0 | (69,119) |  |  | 1,495 |  | (106,847) |
Fair Value, end of period |  | 1,805,260 | 1,255,935 |  | $ 1,367,154 | 1,805,260 |  | 1,255,935 |
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 |  | 318 | (156) |  |  | 478 |  | (822) |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 344 | (180) |  |  | 580 |  | (845) |
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 |  |  | 15 |  | (2,902) |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  |  | (1,430) |  |  |  |  | (4,571) |
Canadian Provincial Governments [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 671,027 | 572,698 |  |  | 528,124 |  | 593,942 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 16,103 | (27,476) |  |  | 151,944 |  | (55,632) |
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 |  |  | 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 | 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 |  | 690,843 | 548,742 |  | 572,698 | 690,843 |  | 548,742 |
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 |  | 3,713 | 3,520 |  |  | 10,775 |  | 10,432 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 3,713 | 3,520 |  |  | 10,775 |  | 10,432 |
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 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  |  | 0 |  |  |  |  | 0 |
Residential mortgage-backed securities |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 16,032 | 54,839 |  |  | 6,855 |  | 107,882 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 150 | (1) |  |  | 221 |  | (1,782) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] | 0 | 0 |  |  | 3,018 |  | 45,328 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] | 0 | 0 |  |  | 0 |  | (4,961) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | [1] | (2,370) | (3) |  |  | (3,945) |  | (4,538) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 15,421 | 0 |  |  | 23,103 |  | 3,031 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | (6,040) | (54,838) |  |  | 6,040 |  | (145,140) |
Fair Value, end of period |  | 23,080 | 0 |  | 54,839 | 23,080 |  | 0 |
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 |  | (113) | 3 |  |  | (132) |  | (132) |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | (113) | 0 |  |  | (132) |  | 0 |
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 |  |  | 0 |  | 312 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  |  | 0 |  |  |  |  | 0 |
Asset-backed securities |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 110,322 | 70,686 |  |  | 95,572 |  | 123,474 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (51) | (130) |  |  | 1,972 |  | (821) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] | 10,764 | 11,099 |  |  | 50,511 |  | 22,099 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] | 0 | (462) |  |  | 0 |  | (462) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | [1] | (17,929) | (24,166) |  |  | (45,081) |  | (46,449) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0 | 64,009 |  |  | 0 |  | 68,977 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | 0 | (38,915) |  |  | 0 |  | (86,163) |
Fair Value, end of period |  | 103,109 | 82,767 |  | 70,686 | 103,109 |  | 82,767 |
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 |  | 3 | 20 |  |  | 25 |  | 202 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 3 | 13 |  |  | 24 |  | 187 |
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 |  |  | 110 |  | 1,910 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  |  | 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 |  | 9,855 | 16,505 |  |  | 10,202 |  | 41,203 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 132 |  |  | (544) | 164 |  | 46 |
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] | (40) |  |  | (37) | (429) |  | (158) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0 |  |  | 9,859 | 0 |  | 9,859 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  |  |  | 12,144 |  |  | 37,309 |
Fair Value, end of period |  | 9,953 | 13,645 |  | 16,505 | 9,953 |  | 13,645 |
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 |  |  | 6 | 16 |  | 4 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 6 |  |  | 6 | 16 |  | 3 |
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 |  |  |  | 0 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  |  |  | 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 |  | 15,686 | 5,044 |  |  | 5,006 |  | 5,092 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 457 |  |  | (32) | 1,137 |  | (80) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] | 0 |  |  | 0 | 10,000 |  | 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 |  |  | 0 | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  |  |  | 0 |  |  | 0 |
Fair Value, end of period |  | 16,143 | 5,012 |  | 5,044 | 16,143 |  | 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 | 0 |  | 0 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  |  | 0 | 0 |  | 0 |
Debt Security, Government, Non-US [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 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  |  |  | 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 |  | 17,406 | 20,735 |  |  | 18,025 |  | 22,511 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 79 |  |  | (122) | 668 |  | (635) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] | 104 |  |  | 120 | 290 |  | 334 |
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] | (358) |  |  | (374) | (1,577) |  | (1,634) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  |  |  | 0 |  |  | 0 |
Fair Value, end of period |  | 17,141 | 20,252 |  | 20,735 | 17,141 |  | 20,252 |
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 |  | (90) |  |  | (107) | (265) |  | (324) |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | (90) |  |  | (107) | (265) |  | (325) |
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 |  |  |  | 0 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  |  |  | 0 |  |  |
Commercial Mortgage Backed Securities [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 19 | 1,867 |  |  | 22 |  | 3,234 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (975) |  |  | 7 | (975) |  | (56) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] | 1,155 |  |  | 0 | 1,155 |  | 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] | (3) |  |  | (1) | (6) |  | (4) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 29,772 |  |  | 1,752 | 29,772 |  | 1,752 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  |  |  | 1,843 |  |  | 3,144 |
Fair Value, end of period |  | 29,968 | 1,782 |  | 1,867 | 29,968 |  | 1,782 |
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 |  | 0 |
Fair Value, Asset, Recurring Basis, Still Held, 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 |  | 0 |  |  |  | 0 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  |  |  | 0 |  |  |
US Treasury and Government [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] | 0 |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0 |  |  | 0 | 0 |  | 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 |  | 112,767 | 144,610 |  |  | 109,597 |  | 122,194 |
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 |  |  | 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 |  | 121,275 | 142,529 |  | 144,610 | 121,275 |  | 142,529 |
Funds Withheld At Interest Embedded Derivatives [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, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  |  |  | 0 |  |  |
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 |  | 8,508 | (2,081) |  |  | 11,678 |  | 20,335 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 8,508 | (2,081) |  |  | 11,678 |  | 20,335 |
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, Asset, Recurring Basis, Still Held, 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, Asset, Recurring Basis, Still Held, 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 |  | 51,755 | 43,971 |  |  | 47,789 |  | 40,659 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (2,198) | (307) |  |  | (2,559) |  | (1,552) |
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 |  |  | 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 |  | 51,620 | 46,090 |  | 43,971 | 51,620 |  | 46,090 |
Longevity Swap [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, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  |  |  | 0 |  |  |
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, Asset, Recurring Basis, Still Held, 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, Asset, Recurring Basis, Still Held, 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 |  | 2,063 | 2,426 |  |  | 6,390 |  | 6,983 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 2,063 | 2,426 |  |  | 6,390 |  | 6,983 |
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 |  |  | 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 |  | 908,491 | (928,797) |  |  | (944,865) |  | (1,014,228) |
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] | 16,887 | (4,231) |  |  | (12,904) |  | (16,946) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements | [1] | 23,413 | 20,044 |  |  | 61,076 |  | 56,210 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 |  | 0 | 0 |  |  | 0 |  | 0 |
Fair Value, end of period |  | (989,170) | (906,199) |  | (928,797) | (989,170) |  | (906,199) |
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Investment 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 |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  |  |  | 0 |  |  |
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 |  | 42,233 | (32,133) |  |  | 42,116 |  | (62,242) |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 44,965 | (30,433) |  |  | 48,041 |  | (56,808) |
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 |  | 44,972 | (25,348) |  |  | (50,361) |  | 6,523 |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 68,385 | 45,393 |  |  | 111,436 |  | 49,688 |
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, Liability, Recurring Basis, Still Held, 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 |  |  | 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 |  | 853 | 782 |  |  | 369 |  | 1,683 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | 0 | 1 |  |  | 0 |  | 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 |  |  | 0 |  | 1,700 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 |  | 0 | 0 |  |  | 0 |  | 0 |
Fair Value, end of period |  | (853) | (308) |  | 782 | (853) |  | (308) |
Mortality Swap [Member] | Investment 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 |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  |  |  | 0 |  |  |
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, Liability, Recurring Basis, Still Held, 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, Liability, Recurring Basis, Still Held, 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 |  | 0 | (473) |  |  | 484 |  | 326 |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 | 473 |  |  | (484) |  | (326) |
Cash and Cash Equivalents [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Fair Value, beginning of period |  |  |  |  |  | 0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  |  |  |  | 0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] |  |  |  |  | 19 |  |  |
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 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  |  |  |  | 19 |  |  |
Fair Value, end of period |  | 0 |  |  |  | 0 |  |  |
Cash and Cash Equivalents [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 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  |  |  |  |  | 0 |  |  |
Cash and Cash Equivalents [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 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  |  |  |  |  | 0 |  |  |
Cash and Cash Equivalents [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 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  |  |  |  |  | 0 |  |  |
Cash and Cash Equivalents [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 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  |  |  |  |  | 0 |  |  |
Equity securities |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 44,807 | 42,937 |  |  | 33,460 |  | 0 |
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] | 821 | 863 |  |  | 6,621 |  | 13,111 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | 880 | 5,847 | [1] |  | 880 | [1] | 6,416 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | [1] | 0 | 0 |  |  | 0 |  | 48 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  | 0 |  |  |  | 0 |  | 38,905 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  | 0 |  |  |  |  | 0 |
Fair Value, end of period |  | 47,485 | 43,485 |  | 42,937 | 47,485 |  | 43,485 |
Equity 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 |  | 0 |  |  |  | 0 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 |  |  |  | 0 |  |  |
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 |  | 2,737 | 5,532 |  |  | 8,284 |  | (2,067) |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 2,638 | 2,178 |  |  | 8,185 |  | (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, Asset, Recurring Basis, Still Held, 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, beginning of period |  |  |  |  |  |  |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings |  |  | 0 |  |  |  |  | 0 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  |  | 0 |  |  |  |  |  |
Short-term Investments [Member] |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Fair Value, beginning of period |  | 28,387 | 3,217 |  |  | 2,228 |  | 3,096 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  | (266) | 47 |  |  | (134) |  | 1 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | [1] | 1,656 | 1,721 |  |  | 29,664 |  | 2,202 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | [1] | 0 | 0 |  |  | (1,517) |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | [1] | (11) | 0 |  |  | (558) |  | (314) |
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 |  | 27,042 | 2,782 |  |  | 27,064 |  | 2,782 |
Fair Value, end of period |  | 2,857 | 2,203 |  | $ 3,217 | 2,857 |  | 2,203 |
Short-term Investments [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 |  | 133 |  |  |  | 221 |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 133 |  |  |  | 221 |  |  |
Short-term Investments [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 |  |  | 17 |  | 0 |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 | 0 |  |  | 0 |  | 0 |
Short-term Investments [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, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) |  | 0 | 0 |  |  | 0 |  | 0 |
Short-term Investments [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, Asset, Recurring Basis, Still Held, 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 gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&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 gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=117815213&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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