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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | $ 17,830,203 | $ 3,999,294
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (486,345) | (47,884)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 4,471,314 | 4,815,325
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (372,117) | (221,017)
Available for sale securities, continuous unrealized loss position, total, fair value | 22,301,517 | 8,814,619
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (858,462) | (268,901)
United States Government Full Faith and Credit [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 3,207 | 1,565
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (71) | (10)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 6,337 | 6,731
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (363) | (137)
Available for sale securities, continuous unrealized loss position, total, fair value | 9,544 | 8,296
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (434) | (147)
United States Government Sponsored Agencies [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 73,252 | 44,794
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (2,849) | (180)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 917,701 | 958,965
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (72,821) | (31,550)
Available for sale securities, continuous unrealized loss position, total, fair value | 990,953 | 1,003,759
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (75,670) | (31,730)
United States Municipalities, States and Territories [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 331,888 | 44,736
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (7,141) | (128)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 124,246 | 128,499
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (7,694) | (3,468)
Available for sale securities, continuous unrealized loss position, total, fair value | 456,134 | 173,235
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (14,835) | (3,596)
Foreign Government Obligations [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 137,543 | 49,663
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (2,723) | (337)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 11,344 | 12,625
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (2,948) | (1,688)
Available for sale securities, continuous unrealized loss position, total, fair value | 148,887 | 62,288
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (5,671) | (2,025)
Corporate Securities [Member] | Finance, Insurance and Real Estate Sectors [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 2,614,016 | 456,244
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (79,329) | (5,135)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 619,550 | 600,655
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (58,977) | (28,043)
Available for sale securities, continuous unrealized loss position, total, fair value | 3,233,566 | 1,056,899
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (138,306) | (33,178)
Corporate Securities [Member] | Manufacturing, Construction and Mining [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 1,879,373 | 222,985
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (64,814) | (3,475)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 232,902 | 231,196
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (19,930) | (10,849)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,112,275 | 454,181
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (84,744) | (14,324)
Corporate Securities [Member] | Utilities and Related Sectors [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 2,349,475 | 395,183
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (76,830) | (4,099)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 236,132 | 249,416
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (20,938) | (8,901)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,585,607 | 644,599
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (97,768) | (13,000)
Corporate Securities [Member] | Wholesale/Retail Trade [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 1,061,264 | 152,941
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (34,731) | (1,249)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 155,842 | 178,635
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (19,254) | (11,371)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,217,106 | 331,576
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (53,985) | (12,620)
Corporate Securities [Member] | Services, Media and Other [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 4,406,410 | 729,124
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (146,027) | (19,000)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 787,105 | 891,654
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (91,057) | (53,565)
Available for sale securities, continuous unrealized loss position, total, fair value | 5,193,515 | 1,620,778
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (237,084) | (72,565)
Corporate Securities [Member] | Insurance [Member] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position [Abstract] |  |
Held for investment securities, continuous unrealized loss position, less than 12 months, fair value | 0 | 0
Held for investment securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | 0
Held for investment securities, continuous unrealized loss position, 12 months or longer, fair value | 68,108 | 76,460
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (9,047) | (581)
Held for investment securities, continuous unrealized loss position, total, fair value | 68,108 | 76,460
Held for investment securities, continuous unrealized loss position, total, unrealized losses | (9,047) | (581)
Residential Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 343,560 | 39,771
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (6,925) | (387)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 26,164 | 32,917
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (849) | (2,084)
Available for sale securities, continuous unrealized loss position, total, fair value | 369,724 | 72,688
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (7,774) | (2,471)
Commercial Mortgage Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 2,666,425 | 1,096,757
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (48,665) | (10,385)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,234,488 | 1,306,437
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (72,659) | (59,455)
Available for sale securities, continuous unrealized loss position, total, fair value | 3,900,913 | 2,403,194
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (121,324) | (69,840)
Other Asset Backed Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value | 1,963,790 | 765,531
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (16,240) | (3,499)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 119,503 | 217,595
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (4,627) | (9,906)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,083,293 | 983,126
Available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (20,867) | $ (13,405)

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