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
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)

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position.

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months.

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This item represents the fair value of securities categorized as held-to-maturity securities that have been in a continuous unrealized loss position for twelve months or longer.

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