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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 10,735,390 | $ 13,195,027
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (360,136) | (454,013)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,173,243 | 1,368,974
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (100,317) | (130,705)
Available for sale securities, continuous unrealized loss position, total, fair value | 11,908,633 | 14,564,001
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (460,453) | (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 | 7,275 | 7,405
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (252) | (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 | 7,275 | 7,405
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (252) | (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 | 989,089 | 995,548
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (53,376) | (46,913)
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 | 989,089 | 995,548
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (53,376) | (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 | 367,378 | 463,409
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (18,903) | (22,393)
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 | 367,378 | 463,409
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (18,903) | (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 | 24,941 | 29,158
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (147) | (913)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 11,844 | 20,388
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (2,500) | (4,167)
Available for sale securities, continuous unrealized loss position, total, fair value | 36,785 | 49,546
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (2,647) | (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 | 1,443,090 | 1,940,107
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (52,452) | (70,421)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 109,375 | 82,907
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (8,578) | (7,723)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,552,465 | 2,023,014
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (61,030) | (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 | 721,674 | 1,199,420
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (20,261) | (34,304)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 210,686 | 311,591
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (15,139) | (23,273)
Available for sale securities, continuous unrealized loss position, total, fair value | 932,360 | 1,511,011
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (35,400) | (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 | 1,342,397 | 1,401,650
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (33,268) | (45,015)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 53,702 | 58,597
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (4,018) | (5,820)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,396,099 | 1,460,247
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (37,286) | (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 | 596,682 | 637,121
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (21,288) | (18,880)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 29,917 | 29,719
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (1,691) | (1,930)
Available for sale securities, continuous unrealized loss position, total, fair value | 626,599 | 666,840
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (22,979) | (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 | 1,874,016 | 2,539,519
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (61,940) | (82,196)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 640,141 | 716,857
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (59,857) | (79,211)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,514,157 | 3,256,376
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (121,797) | (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 | 70,795 | 68,766
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (6,083) | (8,059)
Held for investment securities, continuous unrealized loss position, total, fair value | 70,795 | 68,766
Held for investment securities, continuous unrealized loss position, total, unrealized losses | (6,083) | (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 | 81,636 | 81,762
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (3,406) | (3,463)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 8,197 | 1,853
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (757) | (91)
Available for sale securities, continuous unrealized loss position, total, fair value | 89,833 | 83,615
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (4,163) | (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 | 2,732,202 | 3,148,395
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (88,183) | (116,938)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 931 | 895
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (41) | (76)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,733,133 | 3,149,290
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (88,224) | (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 | 555,010 | 751,533
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (6,660) | (12,289)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 108,450 | 146,167
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (7,736) | (8,414)
Available for sale securities, continuous unrealized loss position, total, fair value | 663,460 | 897,700
Available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (14,396) | $ (20,703)

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