Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value	$ 6,044,732	$ 13,195,027
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(136,224)	(454,013)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	2,247,116	1,368,974
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(142,370)	(130,705)
Available for sale securities, continuous unrealized loss position, total, fair value	8,291,848	14,564,001
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(278,594)	(584,718)
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	6,731	7,405
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(139)	(288)
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	6,731	7,405
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(139)	(288)
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	914,762	995,548
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(28,722)	(46,913)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	72,024	0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(4,976)	0
Available for sale securities, continuous unrealized loss position, total, fair value	986,786	995,548
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(33,698)	(46,913)
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	206,787	463,409
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(6,467)	(22,393)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	473	0
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(27)	0
Available for sale securities, continuous unrealized loss position, total, fair value	207,260	463,409
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(6,494)	(22,393)
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	49,971	29,158
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(30)	(913)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	12,641	20,388
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(1,682)	(4,167)
Available for sale securities, continuous unrealized loss position, total, fair value	62,612	49,546
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(1,712)	(5,080)
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	691,425	1,940,107
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(22,211)	(70,421)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	270,612	82,907
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(12,683)	(7,723)
Available for sale securities, continuous unrealized loss position, total, fair value	962,037	2,023,014
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(34,894)	(78,144)
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	387,180	1,199,420
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(7,752)	(34,304)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	161,727	311,591
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(9,802)	(23,273)
Available for sale securities, continuous unrealized loss position, total, fair value	548,907	1,511,011
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(17,554)	(57,577)
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	446,845	1,401,650
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(8,962)	(45,015)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	94,224	58,597
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(5,477)	(5,820)
Available for sale securities, continuous unrealized loss position, total, fair value	541,069	1,460,247
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(14,439)	(50,835)
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	244,317	637,121
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(6,418)	(18,880)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	72,601	29,719
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(4,356)	(1,930)
Available for sale securities, continuous unrealized loss position, total, fair value	316,918	666,840
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(10,774)	(20,810)
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	923,719	2,539,519
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(24,079)	(82,196)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	663,689	716,857
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(49,578)	(79,211)
Available for sale securities, continuous unrealized loss position, total, fair value	1,587,408	3,256,376
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(73,657)	(161,407)
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	0
Held for investment securities, continuous unrealized loss position, less than 12 months, unrealized losses	0	0
Held for investment securities, continuous unrealized loss position, 12 months or longer, fair value	75,046	68,766
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(1,940)	(8,059)
Held for investment securities, continuous unrealized loss position, total, fair value	75,046	68,766
Held for investment securities, continuous unrealized loss position, total, unrealized losses	(1,940)	(8,059)
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	31,390	81,762
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(607)	(3,463)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	19,849	1,853
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(1,659)	(91)
Available for sale securities, continuous unrealized loss position, total, fair value	51,239	83,615
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(2,266)	(3,554)
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	1,508,005	3,148,395
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(27,249)	(116,938)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	731,738	895
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(41,068)	(76)
Available for sale securities, continuous unrealized loss position, total, fair value	2,239,743	3,149,290
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(68,317)	(117,014)
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	633,600	751,533
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(3,588)	(12,289)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	147,538	146,167
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(11,062)	(8,414)
Available for sale securities, continuous unrealized loss position, total, fair value	781,138	897,700
Available for sale securities, continuous unrealized loss position, total, unrealized losses	$ (14,650)	$ (20,703)

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=73527792&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=73527792&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
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-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=73527792&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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This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized 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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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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