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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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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 | $ 6,044,732 | $ 13,195,027
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (136,224) | (454,013)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 2,247,116 | 1,368,974
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (142,370) | (130,705)
Available for sale securities, continuous unrealized loss position, total, fair value | 8,291,848 | 14,564,001
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (278,594) | (584,718)
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 | 6,731 | 7,405
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (139) | (288)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | 0
Available for sale securities, continuous unrealized loss position, total, fair value | 6,731 | 7,405
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (139) | (288)
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 | 914,762 | 995,548
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (28,722) | (46,913)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 72,024 | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (4,976) | 0
Available for sale securities, continuous unrealized loss position, total, fair value | 986,786 | 995,548
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (33,698) | (46,913)
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 | 206,787 | 463,409
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (6,467) | (22,393)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 473 | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (27) | 0
Available for sale securities, continuous unrealized loss position, total, fair value | 207,260 | 463,409
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (6,494) | (22,393)
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 | 49,971 | 29,158
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (30) | (913)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 12,641 | 20,388
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (1,682) | (4,167)
Available for sale securities, continuous unrealized loss position, total, fair value | 62,612 | 49,546
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (1,712) | (5,080)
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 | 691,425 | 1,940,107
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (22,211) | (70,421)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 270,612 | 82,907
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (12,683) | (7,723)
Available for sale securities, continuous unrealized loss position, total, fair value | 962,037 | 2,023,014
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (34,894) | (78,144)
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 | 387,180 | 1,199,420
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (7,752) | (34,304)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 161,727 | 311,591
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (9,802) | (23,273)
Available for sale securities, continuous unrealized loss position, total, fair value | 548,907 | 1,511,011
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (17,554) | (57,577)
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 | 446,845 | 1,401,650
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (8,962) | (45,015)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 94,224 | 58,597
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (5,477) | (5,820)
Available for sale securities, continuous unrealized loss position, total, fair value | 541,069 | 1,460,247
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (14,439) | (50,835)
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 | 244,317 | 637,121
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (6,418) | (18,880)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 72,601 | 29,719
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (4,356) | (1,930)
Available for sale securities, continuous unrealized loss position, total, fair value | 316,918 | 666,840
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (10,774) | (20,810)
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 | 923,719 | 2,539,519
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (24,079) | (82,196)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 663,689 | 716,857
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (49,578) | (79,211)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,587,408 | 3,256,376
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (73,657) | (161,407)
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 | 75,046 | 68,766
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (1,940) | (8,059)
Held for investment securities, continuous unrealized loss position, total, fair value | 75,046 | 68,766
Held for investment securities, continuous unrealized loss position, total, unrealized losses | (1,940) | (8,059)
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 | 31,390 | 81,762
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (607) | (3,463)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 19,849 | 1,853
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (1,659) | (91)
Available for sale securities, continuous unrealized loss position, total, fair value | 51,239 | 83,615
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (2,266) | (3,554)
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 | 1,508,005 | 3,148,395
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (27,249) | (116,938)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 731,738 | 895
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (41,068) | (76)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,239,743 | 3,149,290
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (68,317) | (117,014)
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 | 633,600 | 751,533
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (3,588) | (12,289)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 147,538 | 146,167
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (11,062) | (8,414)
Available for sale securities, continuous unrealized loss position, total, fair value | 781,138 | 897,700
Available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (14,650) | $ (20,703)

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