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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	$ 2,924,989	$ 19,341,518
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(80,634)	(803,628)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	5,610,495	6,619,197
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(222,019)	(547,459)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	8,535,484	25,960,715
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(302,653)	(1,351,087)
United States Government Full Faith and Credit
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	0	543
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	0	(3)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	506	7,785
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(1)	(319)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	506	8,328
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(1)	(322)
United States Government Sponsored Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	0	30,089
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	0	(949)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	974,206	953,421
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(16,335)	(82,085)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	974,206	983,510
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(16,335)	(83,034)
United States Municipalities, States and Territories
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	7,395	340,103
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(5)	(6,816)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	40,288	162,997
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(547)	(8,842)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	47,683	503,100
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(552)	(15,658)
Foreign Government Obligations
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	9,959	98,511
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(15)	(1,748)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	13,516	11,859
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(732)	(2,411)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	23,475	110,370
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(747)	(4,159)
Corporate Securities | Finance, Insurance and Real Estate Sectors
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	58,054	2,501,640
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(2,368)	(87,220)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	441,853	884,870
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(11,284)	(77,507)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	499,907	3,386,510
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(13,652)	(164,727)
Corporate Securities | Manufacturing, Construction and Mining
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	25,582	2,045,859
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(727)	(84,972)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	390,348	349,738
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(12,700)	(34,635)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	415,930	2,395,597
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(13,427)	(119,607)
Corporate Securities | Utilities and Related Sectors
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	116,124	2,313,271
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(3,090)	(82,119)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	349,620	591,482
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(11,198)	(45,838)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	465,744	2,904,753
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(14,288)	(127,957)
Corporate Securities | Wholesale/Retail Trade
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	9,887	1,032,603
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(207)	(51,228)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	187,029	198,805
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(15,976)	(26,326)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	196,916	1,231,408
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(16,183)	(77,554)
Corporate Securities | Services, Media and Other
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	156,628	4,618,477
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(8,957)	(196,520)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	1,009,524	1,072,722
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(71,658)	(152,364)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	1,166,152	5,691,199
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(80,615)	(348,884)
Residential Mortgage Backed Securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	73,568	145,613
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(524)	(2,638)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	10,927	22,689
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(958)	(1,487)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	84,495	168,302
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(1,482)	(4,125)
Commercial Mortgage Backed Securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	1,499	2,141,560
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(46)	(37,150)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	702,389	2,090,835
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(12,278)	(97,676)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	703,888	4,232,395
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	(12,324)	(134,826)
Other Asset Backed Securities
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value	2,466,293	4,073,249
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	(64,695)	(252,265)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value	1,490,289	271,994
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	(68,352)	(17,969)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value	3,956,582	4,345,243
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	$ (133,047)	$ (270,234)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

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