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
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)

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.

+ References

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