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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - Fixed Maturity Securities [Member] - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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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 | $ 13,195,027 | $ 13,944,810
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (454,013) | (646,288)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 1,368,974 | 676,956
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (130,705) | (199,057)
Available for sale, continuous unrealized loss position, total, fair value | 14,564,001 | 14,621,766
Available for sale, continuous unrealized loss position, total, unrealized losses | (584,718) | (845,345)
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 | 7,405 | 37,730
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (288) | (299)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 0 | 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | 0 | 0
Available for sale, continuous unrealized loss position, total, fair value | 7,405 | 37,730
Available for sale, continuous unrealized loss position, total, unrealized losses | (288) | (299)
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 | 995,548 | 957,053
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (46,913) | (14,409)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 0 | 0
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | 0 | 0
Available for sale, continuous unrealized loss position, total, fair value | 995,548 | 957,053
Available for sale, continuous unrealized loss position, total, unrealized losses | (46,913) | (14,409)
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 | 463,409 | 261,823
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (22,393) | (8,474)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 0 | 2,846
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | 0 | (154)
Available for sale, continuous unrealized loss position, total, fair value | 463,409 | 264,669
Available for sale, continuous unrealized loss position, total, unrealized losses | (22,393) | (8,628)
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 | 29,158 | 42,966
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (913) | (1,762)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 20,388 | 15,463
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (4,167) | (9,173)
Available for sale, continuous unrealized loss position, total, fair value | 49,546 | 58,429
Available for sale, continuous unrealized loss position, total, unrealized losses | (5,080) | (10,935)
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 | 2,302,103 | 2,077,223
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (79,077) | (59,607)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 110,730 | 49,912
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (9,834) | (14,855)
Available for sale, continuous unrealized loss position, total, fair value | 2,412,833 | 2,127,135
Available for sale, continuous unrealized loss position, total, unrealized losses | (88,911) | (74,462)
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 | 2,556,147 | 3,517,967
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (74,144) | (246,456)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 702,978 | 376,229
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (74,382) | (131,003)
Available for sale, continuous unrealized loss position, total, fair value | 3,259,125 | 3,894,196
Available for sale, continuous unrealized loss position, total, unrealized losses | (148,526) | (377,459)
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 | 1,605,742 | 2,240,652
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (53,055) | (138,940)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 196,085 | 97,184
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (16,208) | (22,565)
Available for sale, continuous unrealized loss position, total, fair value | 1,801,827 | 2,337,836
Available for sale, continuous unrealized loss position, total, unrealized losses | (69,263) | (161,505)
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 | 396,310 | 473,050
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (9,433) | (17,863)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 57,708 | 38,682
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (5,739) | (8,125)
Available for sale, continuous unrealized loss position, total, fair value | 454,018 | 511,732
Available for sale, continuous unrealized loss position, total, unrealized losses | (15,172) | (25,988)
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 | 857,515 | 1,037,011
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (35,107) | (39,937)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 132,170 | 32,050
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (11,794) | (3,073)
Available for sale, continuous unrealized loss position, total, fair value | 989,685 | 1,069,061
Available for sale, continuous unrealized loss position, total, unrealized losses | (46,901) | (43,010)
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 | 65,377
Held for investment, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | (11,245)
Held for investment, continuous unrealized loss position, 12 months or more, fair value | 68,766 | 0
Held for investment, continuous unrealized loss position, 12 months or more, unrealized losses | (8,059) | 0
Held for investment, continuous unrealized loss position, total, fair value | 68,766 | 65,377
Held for investment, continuous unrealized loss position, total, unrealized losses | (8,059) | (11,245)
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 | 81,762 | 162,770
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (3,463) | (2,958)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 1,853 | 6,438
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (91) | (531)
Available for sale, continuous unrealized loss position, total, fair value | 83,615 | 169,208
Available for sale, continuous unrealized loss position, total, unrealized losses | (3,554) | (3,489)
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 | 3,148,395 | 2,679,510
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (116,938) | (105,002)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 895 | 11,495
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (76) | (279)
Available for sale, continuous unrealized loss position, total, fair value | 3,149,290 | 2,691,005
Available for sale, continuous unrealized loss position, total, unrealized losses | (117,014) | (105,281)
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 | 751,533 | 457,055
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (12,289) | (10,581)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 146,167 | 46,657
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (8,414) | (9,299)
Available for sale, continuous unrealized loss position, total, fair value | 897,700 | 503,712
Available for sale, continuous unrealized loss position, total, unrealized losses | $ (20,703) | $ (19,880)

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