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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | $ 3,999,294 | $ 13,195,027
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (47,884) | (454,013)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 4,815,325 | 1,368,974
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (221,017) | (130,705)
Available for sale, continuous unrealized loss position, total, fair value | 8,814,619 | 14,564,001
Available for sale, continuous unrealized loss position, total, unrealized losses | (268,901) | (584,718)
United States Government Full Faith and Credit [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 1,565 | 7,405
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (10) | (288)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 6,731 | 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (137) | 0
Available for sale, continuous unrealized loss position, total, fair value | 8,296 | 7,405
Available for sale, continuous unrealized loss position, total, unrealized losses | (147) | (288)
United States Government Sponsored Agencies [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 44,794 | 995,548
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (180) | (46,913)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 958,965 | 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (31,550) | 0
Available for sale, continuous unrealized loss position, total, fair value | 1,003,759 | 995,548
Available for sale, continuous unrealized loss position, total, unrealized losses | (31,730) | (46,913)
United States Municipalities, States and Territories [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 44,736 | 463,409
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (128) | (22,393)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 128,499 | 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (3,468) | 0
Available for sale, continuous unrealized loss position, total, fair value | 173,235 | 463,409
Available for sale, continuous unrealized loss position, total, unrealized losses | (3,596) | (22,393)
Foreign Government Obligations [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 49,663 | 29,158
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (337) | (913)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 12,625 | 20,388
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (1,688) | (4,167)
Available for sale, continuous unrealized loss position, total, fair value | 62,288 | 49,546
Available for sale, continuous unrealized loss position, total, unrealized losses | (2,025) | (5,080)
Corporate Securities [Member] | Finance, Insurance and Real Estate [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 456,244 | 1,940,107
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (5,135) | (70,421)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 600,655 | 82,907
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (28,043) | (7,723)
Available for sale, continuous unrealized loss position, total, fair value | 1,056,899 | 2,023,014
Available for sale, continuous unrealized loss position, total, unrealized losses | (33,178) | (78,144)
Corporate Securities [Member] | Manufacturing, Construction and Mining [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 222,985 | 1,199,420
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (3,475) | (34,304)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 231,196 | 311,591
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (10,849) | (23,273)
Available for sale, continuous unrealized loss position, total, fair value | 454,181 | 1,511,011
Available for sale, continuous unrealized loss position, total, unrealized losses | (14,324) | (57,577)
Corporate Securities [Member] | Utilities and Related Sectors [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 395,183 | 1,401,650
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (4,099) | (45,015)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 249,416 | 58,597
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (8,901) | (5,820)
Available for sale, continuous unrealized loss position, total, fair value | 644,599 | 1,460,247
Available for sale, continuous unrealized loss position, total, unrealized losses | (13,000) | (50,835)
Corporate Securities [Member] | Wholesale/Retail Trade [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 152,941 | 637,121
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (1,249) | (18,880)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 178,635 | 29,719
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (11,371) | (1,930)
Available for sale, continuous unrealized loss position, total, fair value | 331,576 | 666,840
Available for sale, continuous unrealized loss position, total, unrealized losses | (12,620) | (20,810)
Corporate Securities [Member] | Services, Media and Other [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 729,124 | 2,539,519
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (19,000) | (82,196)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 891,654 | 716,857
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (53,565) | (79,211)
Available for sale, continuous unrealized loss position, total, fair value | 1,620,778 | 3,256,376
Available for sale, continuous unrealized loss position, total, unrealized losses | (72,565) | (161,407)
Corporate Securities [Member] | Insurance [Member] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
Held for investment, continuous unrealized loss position, less than 12 months, fair value | 0 | 0
Held for investment, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Held for investment, continuous unrealized loss position, 12 months or more, fair value | 76,460 | 68,766
Held for investment, continuous unrealized loss position, 12 months or more, unrealized losses | (581) | (8,059)
Held for investment, continuous unrealized loss position, total, fair value | 76,460 | 68,766
Held for investment, continuous unrealized loss position, total, unrealized losses | (581) | (8,059)
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 39,771 | 81,762
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (387) | (3,463)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 32,917 | 1,853
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (2,084) | (91)
Available for sale, continuous unrealized loss position, total, fair value | 72,688 | 83,615
Available for sale, continuous unrealized loss position, total, unrealized losses | (2,471) | (3,554)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 1,096,757 | 3,148,395
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (10,385) | (116,938)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 1,306,437 | 895
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (59,455) | (76)
Available for sale, continuous unrealized loss position, total, fair value | 2,403,194 | 3,149,290
Available for sale, continuous unrealized loss position, total, unrealized losses | (69,840) | (117,014)
Other Asset Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale, continuous unrealized loss position, less than 12 months, fair value | 765,531 | 751,533
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (3,499) | (12,289)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 217,595 | 146,167
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (9,906) | (8,414)
Available for sale, continuous unrealized loss position, total, fair value | 983,126 | 897,700
Available for sale, continuous unrealized loss position, total, unrealized losses | $ (13,405) | $ (20,703)

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