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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 2,924,989 | $ 19,341,518
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (80,634) | (803,628)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 5,610,495 | 6,619,197
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (222,019) | (547,459)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 8,535,484 | 25,960,715
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (302,653) | (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 | 506 | 7,785
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (1) | (319)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 506 | 8,328
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (1) | (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 | 974,206 | 953,421
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (16,335) | (82,085)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 974,206 | 983,510
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (16,335) | (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 | 7,395 | 340,103
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (5) | (6,816)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 40,288 | 162,997
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (547) | (8,842)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 47,683 | 503,100
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (552) | (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 | 9,959 | 98,511
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (15) | (1,748)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 13,516 | 11,859
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (732) | (2,411)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 23,475 | 110,370
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (747) | (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 | 58,054 | 2,501,640
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (2,368) | (87,220)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 441,853 | 884,870
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (11,284) | (77,507)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 499,907 | 3,386,510
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (13,652) | (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 | 25,582 | 2,045,859
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (727) | (84,972)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 390,348 | 349,738
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (12,700) | (34,635)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 415,930 | 2,395,597
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (13,427) | (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 | 116,124 | 2,313,271
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (3,090) | (82,119)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 349,620 | 591,482
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (11,198) | (45,838)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 465,744 | 2,904,753
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (14,288) | (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 | 9,887 | 1,032,603
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (207) | (51,228)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 187,029 | 198,805
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (15,976) | (26,326)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 196,916 | 1,231,408
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (16,183) | (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 | 156,628 | 4,618,477
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (8,957) | (196,520)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 1,009,524 | 1,072,722
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (71,658) | (152,364)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 1,166,152 | 5,691,199
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (80,615) | (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 | 73,568 | 145,613
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (524) | (2,638)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 10,927 | 22,689
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (958) | (1,487)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 84,495 | 168,302
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (1,482) | (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 | 1,499 | 2,141,560
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (46) | (37,150)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 702,389 | 2,090,835
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (12,278) | (97,676)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 703,888 | 4,232,395
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | (12,324) | (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 | 2,466,293 | 4,073,249
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (64,695) | (252,265)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value | 1,490,289 | 271,994
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (68,352) | (17,969)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value | 3,956,582 | 4,345,243
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (133,047) | $ (270,234)

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