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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, 2015 | Dec. 31, 2014
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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 | $ 13,944,810 | $ 2,346,226
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (646,288) | (56,929)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 676,956 | 2,731,950
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (199,057) | (98,492)
Available for sale, continuous unrealized loss position, total, fair value | 14,621,766 | 5,078,176
Available for sale, continuous unrealized loss position, total, unrealized losses | (845,345) | (155,421)
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 | 37,730 | 0
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (299) | 0
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 0 | 498
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | 0 | (15)
Available for sale, continuous unrealized loss position, total, fair value | 37,730 | 498
Available for sale, continuous unrealized loss position, total, unrealized losses | (299) | (15)
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 | 957,053 | 0
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (14,409) | 0
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 0 | 610,339
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | 0 | (13,933)
Available for sale, continuous unrealized loss position, total, fair value | 957,053 | 610,339
Available for sale, continuous unrealized loss position, total, unrealized losses | (14,409) | (13,933)
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 | 261,823 | 0
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (8,474) | 0
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 2,846 | 27,947
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (154) | (711)
Available for sale, continuous unrealized loss position, total, fair value | 264,669 | 27,947
Available for sale, continuous unrealized loss position, total, unrealized losses | (8,628) | (711)
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 | 42,966 | 14,194
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (1,762) | (1,068)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 15,463 | 11,542
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (9,173) | (2,885)
Available for sale, continuous unrealized loss position, total, fair value | 58,429 | 25,736
Available for sale, continuous unrealized loss position, total, unrealized losses | (10,935) | (3,953)
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 | 2,077,223 | 253,439
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (59,607) | (2,586)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 49,912 | 399,874
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (14,855) | (16,277)
Available for sale, continuous unrealized loss position, total, fair value | 2,127,135 | 653,313
Available for sale, continuous unrealized loss position, total, unrealized losses | (74,462) | (18,863)
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 | 3,517,967 | 1,078,089
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (246,456) | (35,151)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 376,229 | 694,088
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (131,003) | (35,926)
Available for sale, continuous unrealized loss position, total, fair value | 3,894,196 | 1,772,177
Available for sale, continuous unrealized loss position, total, unrealized losses | (377,459) | (71,077)
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 | 2,240,652 | 373,952
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (138,940) | (8,185)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 97,184 | 344,313
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (22,565) | (10,153)
Available for sale, continuous unrealized loss position, total, fair value | 2,337,836 | 718,265
Available for sale, continuous unrealized loss position, total, unrealized losses | (161,505) | (18,338)
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 | 473,050 | 88,766
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (17,863) | (2,290)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 38,682 | 99,427
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (8,125) | (3,122)
Available for sale, continuous unrealized loss position, total, fair value | 511,732 | 188,193
Available for sale, continuous unrealized loss position, total, unrealized losses | (25,988) | (5,412)
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 | 1,037,011 | 131,940
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (39,937) | (1,567)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 32,050 | 277,296
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (3,073) | (8,139)
Available for sale, continuous unrealized loss position, total, fair value | 1,069,061 | 409,236
Available for sale, continuous unrealized loss position, total, unrealized losses | (43,010) | (9,706)
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 | 65,377 | 0
Held for investment, continuous unrealized loss position, less than 12 months, unrealized losses | (11,245) | 0
Held for investment, continuous unrealized loss position, 12 months or more, fair value | 0 | 75,838
Held for investment, continuous unrealized loss position, 12 months or more, unrealized losses | 0 | (594)
Held for investment, continuous unrealized loss position, total, fair value | 65,377 | 75,838
Held for investment, continuous unrealized loss position, total, unrealized losses | (11,245) | (594)
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 | 162,770 | 22,115
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (2,958) | (1,219)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 6,438 | 20,427
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (531) | (986)
Available for sale, continuous unrealized loss position, total, fair value | 169,208 | 42,542
Available for sale, continuous unrealized loss position, total, unrealized losses | (3,489) | (2,205)
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 | 2,679,510 | 241,637
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (105,002) | (1,344)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 11,495 | 187,241
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (279) | (1,979)
Available for sale, continuous unrealized loss position, total, fair value | 2,691,005 | 428,878
Available for sale, continuous unrealized loss position, total, unrealized losses | (105,281) | (3,323)
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 | 457,055 | 142,094
Available for sale, continuous unrealized loss position, less than 12 months, unrealized losses | (10,581) | (3,519)
Available for sale, continuous unrealized loss position, 12 months or more, fair value | 46,657 | 58,958
Available for sale, continuous unrealized loss position, 12 months or more, unrealized losses | (9,299) | (4,366)
Available for sale, continuous unrealized loss position, total, fair value | 503,712 | 201,052
Available for sale, continuous unrealized loss position, total, unrealized losses | $ (19,880) | $ (7,885)

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