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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - Fixed Maturity Securities [Member] - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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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 | $ 6,279,915 | $ 13,944,810
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (303,064) | (646,288)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,477,013 | 676,956
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (238,239) | (199,057)
Available for sale securities, continuous unrealized loss position, total, fair value | 7,756,928 | 14,621,766
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (541,303) | (845,345)
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 | 6,803 | 37,730
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (60) | (299)
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 | 6,803 | 37,730
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (60) | (299)
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 | 89,633 | 957,053
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (367) | (14,409)
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 | 89,633 | 957,053
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (367) | (14,409)
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 | 72,441 | 261,823
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (946) | (8,474)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 21,519 | 2,846
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (1,135) | (154)
Available for sale securities, continuous unrealized loss position, total, fair value | 93,960 | 264,669
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (2,081) | (8,628)
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 | 19,523 | 42,966
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (116) | (1,762)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 17,200 | 15,463
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (7,416) | (9,173)
Available for sale securities, continuous unrealized loss position, total, fair value | 36,723 | 58,429
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (7,532) | (10,935)
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 | 763,808 | 2,077,223
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (25,577) | (59,607)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 205,317 | 49,912
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (18,958) | (14,855)
Available for sale securities, continuous unrealized loss position, total, fair value | 969,125 | 2,127,135
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (44,535) | (74,462)
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 | 1,597,989 | 3,517,967
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (120,533) | (246,456)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 616,441 | 376,229
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (140,715) | (131,003)
Available for sale securities, continuous unrealized loss position, total, fair value | 2,214,430 | 3,894,196
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (261,248) | (377,459)
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 | 969,160 | 2,240,652
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (57,648) | (138,940)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 294,026 | 97,184
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (38,246) | (22,565)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,263,186 | 2,337,836
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (95,894) | (161,505)
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 | 231,211 | 473,050
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (6,500) | (17,863)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 54,985 | 38,682
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (6,543) | (8,125)
Available for sale securities, continuous unrealized loss position, total, fair value | 286,196 | 511,732
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (13,043) | (25,988)
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 | 429,239 | 1,037,011
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (12,617) | (39,937)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 120,737 | 32,050
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (8,803) | (3,073)
Available for sale securities, continuous unrealized loss position, total, fair value | 549,976 | 1,069,061
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (21,420) | (43,010)
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 | 67,672 | 65,377
Held for investment securities, continuous unrealized loss position, less than 12 months, unrealized losses | (9,000) | (11,245)
Held for investment securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 0
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | 0
Held for investment securities, continuous unrealized loss position, total, fair value | 67,672 | 65,377
Held for investment securities, continuous unrealized loss position, total, unrealized losses | (9,000) | (11,245)
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 | 61,677 | 162,770
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (2,372) | (2,958)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,307 | 6,438
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (27) | (531)
Available for sale securities, continuous unrealized loss position, total, fair value | 62,984 | 169,208
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (2,399) | (3,489)
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 | 1,613,984 | 2,679,510
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (64,626) | (105,002)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 93,864 | 11,495
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (7,431) | (279)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,707,848 | 2,691,005
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (72,057) | (105,281)
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 | 424,447 | 457,055
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (11,702) | (10,581)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 51,617 | 46,657
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (8,965) | (9,299)
Available for sale securities, continuous unrealized loss position, total, fair value | 476,064 | 503,712
Available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (20,667) | $ (19,880)

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