Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - Fixed Maturity Securities [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value	$ 6,279,915	$ 13,944,810
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(303,064)	(646,288)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	1,477,013	676,956
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(238,239)	(199,057)
Available for sale securities, continuous unrealized loss position, total, fair value	7,756,928	14,621,766
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(541,303)	(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	6,803	37,730
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(60)	(299)
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	6,803	37,730
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(60)	(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	89,633	957,053
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(367)	(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	89,633	957,053
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(367)	(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	72,441	261,823
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(946)	(8,474)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	21,519	2,846
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(1,135)	(154)
Available for sale securities, continuous unrealized loss position, total, fair value	93,960	264,669
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(2,081)	(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	19,523	42,966
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(116)	(1,762)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	17,200	15,463
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(7,416)	(9,173)
Available for sale securities, continuous unrealized loss position, total, fair value	36,723	58,429
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(7,532)	(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	763,808	2,077,223
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(25,577)	(59,607)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	205,317	49,912
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(18,958)	(14,855)
Available for sale securities, continuous unrealized loss position, total, fair value	969,125	2,127,135
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(44,535)	(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	1,597,989	3,517,967
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(120,533)	(246,456)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	616,441	376,229
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(140,715)	(131,003)
Available for sale securities, continuous unrealized loss position, total, fair value	2,214,430	3,894,196
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(261,248)	(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	969,160	2,240,652
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(57,648)	(138,940)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	294,026	97,184
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(38,246)	(22,565)
Available for sale securities, continuous unrealized loss position, total, fair value	1,263,186	2,337,836
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(95,894)	(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	231,211	473,050
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(6,500)	(17,863)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	54,985	38,682
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(6,543)	(8,125)
Available for sale securities, continuous unrealized loss position, total, fair value	286,196	511,732
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(13,043)	(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	429,239	1,037,011
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(12,617)	(39,937)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	120,737	32,050
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(8,803)	(3,073)
Available for sale securities, continuous unrealized loss position, total, fair value	549,976	1,069,061
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(21,420)	(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	67,672	65,377
Held for investment securities, continuous unrealized loss position, less than 12 months, unrealized losses	(9,000)	(11,245)
Held for investment securities, continuous unrealized loss position, 12 months or longer, fair value	0	0
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses	0	0
Held for investment securities, continuous unrealized loss position, total, fair value	67,672	65,377
Held for investment securities, continuous unrealized loss position, total, unrealized losses	(9,000)	(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	61,677	162,770
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(2,372)	(2,958)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	1,307	6,438
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(27)	(531)
Available for sale securities, continuous unrealized loss position, total, fair value	62,984	169,208
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(2,399)	(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	1,613,984	2,679,510
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(64,626)	(105,002)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	93,864	11,495
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(7,431)	(279)
Available for sale securities, continuous unrealized loss position, total, fair value	1,707,848	2,691,005
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(72,057)	(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	424,447	457,055
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(11,702)	(10,581)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	51,617	46,657
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(8,965)	(9,299)
Available for sale securities, continuous unrealized loss position, total, fair value	476,064	503,712
Available for sale securities, continuous unrealized loss position, total, unrealized losses	$ (20,667)	$ (19,880)

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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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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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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