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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, 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 | $ 2,426,891 | $ 13,944,810
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (58,282) | (646,288)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,400,531 | 676,956
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (125,364) | (199,057)
Available for sale securities, continuous unrealized loss position, total, fair value | 3,827,422 | 14,621,766
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (183,646) | (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 | 76,581 | 957,053
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (419) | (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 | 76,581 | 957,053
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (419) | (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 | 68,084 | 261,823
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (368) | (8,474)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 0 | 2,846
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | 0 | (154)
Available for sale securities, continuous unrealized loss position, total, fair value | 68,084 | 264,669
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (368) | (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 | 20,750 | 15,463
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (3,825) | (9,173)
Available for sale securities, continuous unrealized loss position, total, fair value | 20,750 | 58,429
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (3,825) | (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 | 453,189 | 2,077,223
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (5,447) | (59,607)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 100,261 | 49,912
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (5,376) | (14,855)
Available for sale securities, continuous unrealized loss position, total, fair value | 553,450 | 2,127,135
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (10,823) | (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 | 271,769 | 3,517,967
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (5,102) | (246,456)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 764,319 | 376,229
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (80,318) | (131,003)
Available for sale securities, continuous unrealized loss position, total, fair value | 1,036,088 | 3,894,196
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (85,420) | (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 | 157,473 | 2,240,652
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (3,440) | (138,940)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 221,059 | 97,184
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (17,989) | (22,565)
Available for sale securities, continuous unrealized loss position, total, fair value | 378,532 | 2,337,836
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (21,429) | (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 | 16,064 | 473,050
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (75) | (17,863)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 59,574 | 38,682
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (3,914) | (8,125)
Available for sale securities, continuous unrealized loss position, total, fair value | 75,638 | 511,732
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (3,989) | (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 | 136,667 | 1,037,011
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (4,545) | (39,937)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 133,607 | 32,050
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (7,944) | (3,073)
Available for sale securities, continuous unrealized loss position, total, fair value | 270,274 | 1,069,061
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (12,489) | (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 | 75,547 | 0
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (1,226) | 0
Held for investment securities, continuous unrealized loss position, total, fair value | 75,547 | 65,377
Held for investment securities, continuous unrealized loss position, total, unrealized losses | (1,226) | (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 | 38,200 | 162,770
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (2,144) | (2,958)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 1,976 | 6,438
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (87) | (531)
Available for sale securities, continuous unrealized loss position, total, fair value | 40,176 | 169,208
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (2,231) | (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 | 945,680 | 2,679,510
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (27,518) | (105,002)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 937 | 11,495
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (33) | (279)
Available for sale securities, continuous unrealized loss position, total, fair value | 946,617 | 2,691,005
Available for sale securities, continuous unrealized loss position, total, unrealized losses | (27,551) | (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 | 263,184 | 457,055
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses | (9,224) | (10,581)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value | 98,048 | 46,657
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses | (5,878) | (9,299)
Available for sale securities, continuous unrealized loss position, total, fair value | 361,232 | 503,712
Available for sale securities, continuous unrealized loss position, total, unrealized losses | $ (15,102) | $ (19,880)

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