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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - Fixed Maturity Securities [Member] - USD ($) $ in Thousands | Jun. 30, 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 | $ 2,479,740 | $ 13,944,810
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (100,817) | (646,288)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,621,441 | 676,956
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (175,824) | (199,057)
Available for sale securities, continuous unrealized loss position, total, fair value | 4,101,181 | 14,621,766
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (276,641) | (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 |  | 37,730
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |  | (299)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value |  | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |  | 0
Available for sale securities, continuous unrealized loss position, total, fair value |  | 37,730
Available for sale securities, continuous unrealized loss position, total, unrealized losses |  | (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 | 61,450 | 957,053
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (550) | (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 | 61,450 | 957,053
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (550) | (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 | 0 | 261,823
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | (8,474)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 6,752 | 2,846
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (683) | (154)
Available for sale securities, continuous unrealized loss position, total, fair value | 6,752 | 264,669
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (683) | (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 | 0 | 42,966
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | (1,762)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 19,141 | 15,463
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (5,455) | (9,173)
Available for sale securities, continuous unrealized loss position, total, fair value | 19,141 | 58,429
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (5,455) | (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 | 168,620 | 2,077,223
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (8,462) | (59,607)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 172,731 | 49,912
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (7,056) | (14,855)
Available for sale securities, continuous unrealized loss position, total, fair value | 341,351 | 2,127,135
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (15,518) | (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 | 354,576 | 3,517,967
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (24,505) | (246,456)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 764,467 | 376,229
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (107,685) | (131,003)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,119,043 | 3,894,196
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (132,190) | (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 | 209,329 | 2,240,652
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (6,837) | (138,940)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 345,800 | 97,184
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (28,023) | (22,565)
Available for sale securities, continuous unrealized loss position, total, fair value | 555,129 | 2,337,836
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (34,860) | (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 | 80,220 | 473,050
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (2,736) | (17,863)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 62,330 | 38,682
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (7,574) | (8,125)
Available for sale securities, continuous unrealized loss position, total, fair value | 142,550 | 511,732
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (10,310) | (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 | 97,145 | 1,037,011
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (7,014) | (39,937)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 151,222 | 32,050
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (12,488) | (3,073)
Available for sale securities, continuous unrealized loss position, total, fair value | 248,367 | 1,069,061
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (19,502) | (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 | 0 | 65,377
Held for investment securities, continuous unrealized loss position, less than 12 months, unrealized losses | 0 | (11,245)
Held for investment securities, continuous unrealized loss position, 12 months or longer, fair value | 68,542 | 0
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (8,180) | 0
Held for investment securities, continuous unrealized loss position, total, fair value | 68,542 | 65,377
Held for investment securities, continuous unrealized loss position, total, unrealized losses | (8,180) | (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 | 39,184 | 162,770
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (1,258) | (2,958)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 653 | 6,438
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (20) | (531)
Available for sale securities, continuous unrealized loss position, total, fair value | 39,837 | 169,208
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (1,278) | (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 | 1,164,578 | 2,679,510
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (38,822) | (105,002)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 11,495
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | (279)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,164,578 | 2,691,005
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (38,822) | (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 | 304,638 | 457,055
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (10,633) | (10,581)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 98,345 | 46,657
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (6,840) | (9,299)
Available for sale securities, continuous unrealized loss position, total, fair value | 402,983 | 503,712
Available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (17,473) | $ (19,880)

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