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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | $ 5,128,156 | $ 19,341,518
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (186,146) | (803,628)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 9,145,105 | 6,619,197
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (394,394) | (547,459)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 14,273,261 | 25,960,715
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (580,540) | (1,351,087)
United States Government Full Faith and Credit |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 0 | 543
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | (3)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 7,794 | 7,785
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (144) | (319)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 7,794 | 8,328
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (144) | (322)
United States Government Sponsored Agencies |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 0 | 30,089
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | (949)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 1,014,518 | 953,421
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (39,828) | (82,085)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 1,014,518 | 983,510
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (39,828) | (83,034)
United States Municipalities, States and Territories |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 13,121 | 340,103
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (48) | (6,816)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 130,540 | 162,997
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (3,531) | (8,842)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 143,661 | 503,100
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (3,579) | (15,658)
Foreign Government Obligations |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 0 | 98,511
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | (1,748)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 37,676 | 11,859
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (1,651) | (2,411)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 37,676 | 110,370
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (1,651) | (4,159)
Corporate Securities | Finance, Insurance and Real Estate Sectors |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 255,189 | 2,501,640
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (11,742) | (87,220)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 1,304,783 | 884,870
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (47,440) | (77,507)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 1,559,972 | 3,386,510
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (59,182) | (164,727)
Corporate Securities | Manufacturing, Construction and Mining |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 263,649 | 2,045,859
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (5,570) | (84,972)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 879,477 | 349,738
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (39,948) | (34,635)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 1,143,126 | 2,395,597
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (45,518) | (119,607)
Corporate Securities | Utilities and Related Sectors |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 186,483 | 2,313,271
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (5,154) | (82,119)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 1,076,726 | 591,482
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (34,703) | (45,838)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 1,263,209 | 2,904,753
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (39,857) | (127,957)
Corporate Securities | Wholesale/Retail Trade |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 117,766 | 1,032,603
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (2,227) | (51,228)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 468,303 | 198,805
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (30,444) | (26,326)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 586,069 | 1,231,408
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (32,671) | (77,554)
Corporate Securities | Services, Media and Other |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 436,745 | 4,618,477
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (15,419) | (196,520)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 2,154,502 | 1,072,722
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (131,629) | (152,364)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 2,591,247 | 5,691,199
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (147,048) | (348,884)
Residential Mortgage Backed Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 41,759 | 145,613
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (485) | (2,638)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 14,201 | 22,689
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (967) | (1,487)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 55,960 | 168,302
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (1,452) | (4,125)
Commercial Mortgage Backed Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 71,872 | 2,141,560
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (514) | (37,150)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 1,611,230 | 2,090,835
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (39,373) | (97,676)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 1,683,102 | 4,232,395
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (39,887) | (134,826)
Other Asset Backed Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value | 3,741,572 | 4,073,249
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (144,987) | (252,265)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 445,355 | 271,994
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (24,736) | (17,969)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 4,186,927 | 4,345,243
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (169,723) | $ (270,234)

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