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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - Fixed Maturity Securities [Member] - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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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 | $ 9,357,244 | $ 2,346,226
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (358,201) | (56,929)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 592,550 | 2,731,950
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (125,667) | (98,492)
Available for sale securities, continuous unrealized loss position, total, fair value | 9,949,794 | 5,078,176
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (483,868) | (155,421)
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 | 7,431 | 0
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (111) | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 498
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | (15)
Available for sale securities, continuous unrealized loss position, total, fair value | 7,431 | 498
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (111) | (15)
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 | 589,545 | 0
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (7,702) | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 610,339
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | (13,933)
Available for sale securities, continuous unrealized loss position, total, fair value | 589,545 | 610,339
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (7,702) | (13,933)
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 | 217,954 | 0
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (8,115) | 0
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 2,894 | 27,947
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (106) | (711)
Available for sale securities, continuous unrealized loss position, total, fair value | 220,848 | 27,947
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (8,221) | (711)
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 | 43,821 | 14,194
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (898) | (1,068)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 15,400 | 11,542
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (9,255) | (2,885)
Available for sale securities, continuous unrealized loss position, total, fair value | 59,221 | 25,736
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (10,153) | (3,953)
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 | 1,552,033 | 253,439
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (38,683) | (2,586)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 51,196 | 399,874
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (13,569) | (16,277)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,603,229 | 653,313
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (52,252) | (18,863)
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 | 2,735,903 | 1,078,089
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (155,795) | (35,151)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 319,447 | 694,088
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (77,062) | (35,926)
Available for sale securities, continuous unrealized loss position, total, fair value | 3,055,350 | 1,772,177
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (232,857) | (71,077)
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 | 1,681,159 | 373,952
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (74,879) | (8,185)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 67,812 | 344,313
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (9,995) | (10,153)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,748,971 | 718,265
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (84,874) | (18,338)
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 | 335,950 | 88,766
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (13,414) | (2,290)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 41,296 | 99,427
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (6,234) | (3,122)
Available for sale securities, continuous unrealized loss position, total, fair value | 377,246 | 188,193
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (19,648) | (5,412)
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 | 692,146 | 131,940
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (24,241) | (1,567)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 33,986 | 277,296
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (1,146) | (8,139)
Available for sale securities, continuous unrealized loss position, total, fair value | 726,132 | 409,236
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (25,387) | (9,706)
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 | 62,000 | 0
Held for investment securities, continuous unrealized loss position, less than 12 months, unrealized losses | (14,574) | 0
Held for investment securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 75,838
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | (594)
Held for investment securities, continuous unrealized loss position, total, fair value | 62,000 | 75,838
Held for investment securities, continuous unrealized loss position, total, unrealized losses | (14,574) | (594)
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 | 51,190 | 22,115
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (1,180) | (1,219)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 7,110 | 20,427
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (653) | (986)
Available for sale securities, continuous unrealized loss position, total, fair value | 58,300 | 42,542
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (1,833) | (2,205)
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 | 1,283,393 | 241,637
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (30,043) | (1,344)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 4,768 | 187,241
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (117) | (1,979)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,288,161 | 428,878
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (30,160) | (3,323)
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 | 166,719 | 142,094
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (3,140) | (3,519)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 48,641 | 58,958
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (7,530) | (4,366)
Available for sale securities, continuous unrealized loss position, total, fair value | 215,360 | 201,052
Available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (10,670) | $ (7,885)

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