Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Available for sale securities, continuous unrealized loss position, less than 12 months, fair value	$ 17,830,203	$ 3,999,294
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(486,345)	(47,884)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	4,471,314	4,815,325
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(372,117)	(221,017)
Available for sale securities, continuous unrealized loss position, total, fair value	22,301,517	8,814,619
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(858,462)	(268,901)
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	3,207	1,565
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(71)	(10)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	6,337	6,731
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(363)	(137)
Available for sale securities, continuous unrealized loss position, total, fair value	9,544	8,296
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(434)	(147)
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	73,252	44,794
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(2,849)	(180)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	917,701	958,965
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(72,821)	(31,550)
Available for sale securities, continuous unrealized loss position, total, fair value	990,953	1,003,759
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(75,670)	(31,730)
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	331,888	44,736
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(7,141)	(128)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	124,246	128,499
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(7,694)	(3,468)
Available for sale securities, continuous unrealized loss position, total, fair value	456,134	173,235
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(14,835)	(3,596)
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	137,543	49,663
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(2,723)	(337)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	11,344	12,625
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(2,948)	(1,688)
Available for sale securities, continuous unrealized loss position, total, fair value	148,887	62,288
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(5,671)	(2,025)
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	2,614,016	456,244
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(79,329)	(5,135)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	619,550	600,655
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(58,977)	(28,043)
Available for sale securities, continuous unrealized loss position, total, fair value	3,233,566	1,056,899
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(138,306)	(33,178)
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	1,879,373	222,985
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(64,814)	(3,475)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	232,902	231,196
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(19,930)	(10,849)
Available for sale securities, continuous unrealized loss position, total, fair value	2,112,275	454,181
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(84,744)	(14,324)
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	2,349,475	395,183
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(76,830)	(4,099)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	236,132	249,416
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(20,938)	(8,901)
Available for sale securities, continuous unrealized loss position, total, fair value	2,585,607	644,599
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(97,768)	(13,000)
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	1,061,264	152,941
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(34,731)	(1,249)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	155,842	178,635
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(19,254)	(11,371)
Available for sale securities, continuous unrealized loss position, total, fair value	1,217,106	331,576
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(53,985)	(12,620)
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	4,406,410	729,124
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(146,027)	(19,000)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	787,105	891,654
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(91,057)	(53,565)
Available for sale securities, continuous unrealized loss position, total, fair value	5,193,515	1,620,778
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(237,084)	(72,565)
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	68,108	76,460
Held for investment securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(9,047)	(581)
Held for investment securities, continuous unrealized loss position, total, fair value	68,108	76,460
Held for investment securities, continuous unrealized loss position, total, unrealized losses	(9,047)	(581)
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	343,560	39,771
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(6,925)	(387)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	26,164	32,917
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(849)	(2,084)
Available for sale securities, continuous unrealized loss position, total, fair value	369,724	72,688
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(7,774)	(2,471)
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	2,666,425	1,096,757
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(48,665)	(10,385)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	1,234,488	1,306,437
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(72,659)	(59,455)
Available for sale securities, continuous unrealized loss position, total, fair value	3,900,913	2,403,194
Available for sale securities, continuous unrealized loss position, total, unrealized losses	(121,324)	(69,840)
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	1,963,790	765,531
Available for sale securities, continuous unrealized loss position, less than 12 months, unrealized losses	(16,240)	(3,499)
Available for sale securities, continuous unrealized loss position, 12 months or longer, fair value	119,503	217,595
Available for sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses	(4,627)	(9,906)
Available for sale securities, continuous unrealized loss position, total, fair value	2,083,293	983,126
Available for sale securities, continuous unrealized loss position, total, unrealized losses	$ (20,867)	$ (13,405)

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=82897076&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=82897076&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
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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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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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