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Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 1,668,563 |  | $ 974,169 |  | $ 872,179 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 1,668,563 |  | 974,191 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | (44,299) |  | 34,488 |  | 21,011 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 331,439 | [1] | 853,848 | [1] | 305,401 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (271,402) | [1] | (60,224) | [1] | (48,653) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (285,586) | [1] | (144,667) | [1] | (125,797) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 33,776 |  | 65,283 |  | 80,302 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | (77,930) |  | (44,611) |  | (132,333) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 1,345,289 |  | 1,668,563 |  | 974,191 |
Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 93,931 |  | 81,655 |  | 183,291 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 93,931 |  | 81,655 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 821 |  | 2,863 |  | 4,580 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 73,563 | [1] | 77,781 | [1] | 6,478 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (7,146) | [1] | (48,828) | [1] | (21,178) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (26,661) | [1] | (8,541) | [1] | (16,672) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 24,727 |  | 19,632 |  | 30,159 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | (5,455) |  | (30,751) |  | (103,807) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 153,505 |  | 93,931 |  | 81,655 |
Asset-backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 232,391 |  | 193,492 |  | 228,558 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 232,391 |  | 193,492 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 17,150 |  | 21,463 |  | 3,902 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 264,804 | [1] | 111,567 | [1] | 65,467 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (26,005) | [1] | (13,140) | [1] | (27,844) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (20,872) | [1] | (16,235) | [1] | (24,092) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 9,031 |  | 11,832 |  | 45,984 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | (9,950) |  | (77,286) |  | (89,933) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 471,848 |  | 232,391 |  | 193,492 |
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 167,006 |  | 115,976 |  | 147,556 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 167,006 |  | 115,976 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 36,731 |  | 24,663 |  | 8,060 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 19,420 | [1] | 31,699 | [1] | 7,683 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (83,974) | [1] | (14,060) | [1] | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (7,970) | [1] | (813) | [1] | (3,548) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 4,081 |  | 64,116 |  | 76,955 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | (18,722) |  | (47,104) |  | (110,697) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 101,785 |  | 167,006 |  | 115,976 |
US Treasury and Government [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 4,538 |  | 0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 4,538 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | (639) |  | (12) |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 128 | [1] | 4,639 | [1] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [1] | 0 | [1] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (2,633) | [1] | 0 | [1] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 44,394 |  | 0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | (4,538) |  | 0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 40,919 |  | 4,538 |  |  |
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 43,212 |  | 10,373 |  | 6,983 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 43,212 |  | 10,373 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 222 |  | 4,491 |  | 3,390 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | [1] | 0 | [1] | 2,334 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [1] | 0 | [1] | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (657) | [1] | (413) | [1] | (88) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 979 |  | 37,588 |  | 48,469 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  | (8,825) |  | (51,061) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 43,776 |  | 43,212 |  | 10,373 |
Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 28,280 |  | 0 |  | 6,736 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 28,280 |  | 0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | (1,570) |  | (139) |  | 4 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | [1] | 28,463 | [1] | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [1] | 0 | [1] | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (295) | [1] | 0 | [1] | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 11,887 |  | 0 |  | 20 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  | 0 |  | (6,762) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 37,997 |  | 28,280 |  | 0 |
Funds Withheld At Interest Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | (243,177) |  | (361,456) |  | (274,220) |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | (243,177) |  | (361,456) |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | [1] | 0 | [1] | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [1] | 0 | [1] | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | [1] | 0 | [1] | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 0 |  | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | (176,270) |  | (243,177) |  | (361,456) |
Short-term Investments [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 22,031 |  | 0 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 22,031 |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | (27) |  | 28 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | [1] | 22,014 | [1] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [1] | 0 | [1] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (22,000) | [1] | 0 | [1] |  |
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, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 0 |  | 22,031 |  |  |
Other Debt Obligations [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 11,489 |  | 16,416 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  |  | 11,489 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) |  |  | 843 |  | (4,663) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases |  |  | 108 | [1] | 797 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | (3,788) | [1] | (4,565) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  |  | 0 | [1] | 0 | [1]
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 |  |  | (9,750) |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  |  | 0 |  | 11,489 |
Reinsurance Ceded Receivable Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  |  | 4,945 |  | 75,431 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  |  | 4,945 |  |  |
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 |  |  | 0 | [1] | 6,201 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  |  | 0 | [1] | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements |  |  | (4,496) | [1] | (86,108) | [1]
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, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value |  |  | 0 |  | 4,945 |
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | (912,361) |  | (1,028,241) |  | (721,485) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 |  | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases | (57,391) | [1] | (63,934) | [1] | (71,505) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales | 0 | [1] | 0 | [1] | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements | 74,386 | [1] | 105,983 | [1] | 79,418 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 | 0 |  | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 | 0 |  | 0 |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | (868,725) |  | (912,361) |  | (1,028,241) |
Nonredeemable Preferred Stock [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 0 |  |  |  | 420 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 323 |  |  |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 0 | [1] |  |  | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | [1] |  |  | (420) | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | [1] |  |  | 0 | [1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 4,639 |  |  |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 |  |  |  | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value | 4,962 |  |  |  | 0 |
Investment Income [Member] | Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | (8,194) |  | (6,839) |  | 218 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | (7,885) |  | (6,852) |  | 162 |
Investment Income [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | 19 |  | 431 |  | 836 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 47 |  | 295 |  | 816 |
Investment Income [Member] | Asset-backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | 6,430 |  | 1,214 |  | 1,686 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 6,425 |  | 1,156 |  | 1,595 |
Investment Income [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | 1,917 |  | 2,032 |  | 2,321 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 1,741 |  | 2,032 |  | 2,307 |
Investment Income [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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) |  | (89) |  |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | (156) |  | (89) |  |  |
Investment Income [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | 36 |  | 14 |  | 361 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 36 |  | 14 |  | 361 |
Investment Income [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | (305) |  | (44) |  | 2 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | (305) |  | (44) |  | 0 |
Investment Income [Member] | Funds Withheld At Interest Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Investment Income [Member] | Short-term Investments [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | (4) |  | (11) |  |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | (4) |  | (11) |  |  |
Investment Income [Member] | Other Debt Obligations [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Investment Income [Member] | Reinsurance Ceded Receivable Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Investment Income [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And 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 |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Investment Income [Member] | Nonredeemable Preferred Stock [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Investment Related Gains Losses [Member] | Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | (1,078) |  | (2,884) |  | 1,863 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | (202) |  | (1,329) |  | (1,223) |
Investment Related Gains Losses [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | (294) |  | (311) |  | (2,032) |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | (269) |  | (594) |
Investment Related Gains Losses [Member] | Asset-backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | (1,131) |  | (516) |  | (10,236) |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | (849) |  | (5,058) |
Investment Related Gains Losses [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | (16,704) |  | (9,503) |  | (12,354) |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | (10,243) |  | (14,163) |  | (12,366) |
Investment Related Gains Losses [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | (175) |  | 0 |  |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  |  |
Investment Related Gains Losses [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | (16) |  | (16) |  | (15) |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Investment Related Gains Losses [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Investment Related Gains Losses [Member] | Funds Withheld At Interest Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 | 66,907 |  | 118,279 |  | (87,236) |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 66,907 |  | 118,279 |  | (87,236) |
Investment Related Gains Losses [Member] | Short-term Investments [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |  |  |
Investment Related Gains Losses [Member] | Other Debt Obligations [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |  |  | 1,098 |  | 3,504 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  |  | (183) |  | 0 |
Investment Related Gains Losses [Member] | Reinsurance Ceded Receivable Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Investment Related Gains Losses [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And 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 | 142,050 |  | 104,613 |  | (224,184) |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 138,683 |  | 97,216 |  | (228,910) |
Investment Related Gains Losses [Member] | Nonredeemable Preferred Stock [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Insurance Claims [Member] | Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Insurance Claims [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Insurance Claims [Member] | Asset-backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Insurance Claims [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Insurance Claims [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |  |  |
Insurance Claims [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Insurance Claims [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Insurance Claims [Member] | Funds Withheld At Interest Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Insurance Claims [Member] | Short-term Investments [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |  |  |
Insurance Claims [Member] | Other Debt Obligations [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Insurance Claims [Member] | Reinsurance Ceded Receivable Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Insurance Claims [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And 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 |  | 770 |  | (2,230) |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 56 |  | (2,346) |
Insurance Claims [Member] | Nonredeemable Preferred Stock [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Interest Income [Member] | Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Interest Income [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Interest Income [Member] | Asset-backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Interest Income [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Interest Income [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |  |  |
Interest Income [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Interest Income [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Interest Income [Member] | Funds Withheld At Interest Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Interest Income [Member] | Short-term Investments [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |  |  |
Interest Income [Member] | Other Debt Obligations [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Interest Income [Member] | Reinsurance Ceded Receivable Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Interest Income [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And 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 | (115,409) |  | (31,552) |  | (88,255) |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | (189,794) |  | (129,828) |  | (167,673) |
Interest Income [Member] | Nonredeemable Preferred Stock [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Asset-backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |  |  |
Policy Acquisition Costs And Other Insurance Expenses [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Funds Withheld At Interest Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Short-term Investments [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |  |  |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Other Debt Obligations [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Reinsurance Ceded Receivable Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |  |  | (449) |  | 9,421 |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  |  | (33) |  | 18,589 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member] |  |  |  |  |  |
Fair Value Assets And 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 |
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 |  | 0 |  | 0 |
Policy Acquisition Costs And Other Insurance Expenses [Member] | Nonredeemable Preferred Stock [Member] |  |  |  |  |  |
Fair Value Assets And Liabilities 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 |
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