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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		$ 790,313		$ 2,992,944
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(24,290)		(122,908)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		2,719,402		2,771,976
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(86,097)		(192,689)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		3,509,715		5,764,920
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(110,387)		(315,597)
Fixed maturity securities, available for sale, allowance for credit losses		14,190	$ 59,698	64,771	$ 50,186	$ 28,332	$ 0
United States Government Full Faith and Credit
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		1,024
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(21)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		1,024
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(21)
Fixed maturity securities, available for sale, allowance for credit losses		0		0
United States Government Sponsored Agencies
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value				250,475
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]			(46)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value				0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]			0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value				250,475
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]			(46)
Fixed maturity securities, available for sale, allowance for credit losses		0		0
United States Municipalities, States and Territories
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		77,867		31,802
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(1,294)		(3,887)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		23,471		868
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(3,353)		(1)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		101,338		32,670
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(4,647)		(3,888)
Fixed maturity securities, available for sale, allowance for credit losses		3,347	2,791	2,844	0	0	0
Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, allowance for credit losses		10,723	55,715	60,193	46,749	28,332	0
Corporate Securities | Finance, Insurance and Real Estate Sectors
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		57,198		109,789
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(3,141)		(1,733)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		0		0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	0		0
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		57,198		109,789
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(3,141)		(1,733)
Corporate Securities | Manufacturing, Construction and Mining
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		36,493		0
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(822)		0
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		19,526		19,335
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(622)		(1,384)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		56,019		19,335
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(1,444)		(1,384)
Corporate Securities | Utilities and Related Sectors
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		95,926		310,823
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(2,384)		(27,509)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		129,273		35,408
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(2,719)		(3,628)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		225,199		346,231
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(5,103)		(31,137)
Corporate Securities | Wholesale/Retail Trade
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		69,030		65,567
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(1,243)		(4,344)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		14,363		16,000
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(598)		(26)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		83,393		81,567
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(1,841)		(4,370)
Corporate Securities | Services, Media and Other
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		51,277		120,098
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(11,107)		(11,564)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		54,762		83,890
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(4,422)		(45,897)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		106,039		203,988
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(15,529)		(57,461)
Residential Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		74,538		156,016
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(1,083)		(2,384)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		46,016		13,599
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(1,548)		(1,876)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		120,554		169,615
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(2,631)		(4,260)
Fixed maturity securities, available for sale, allowance for credit losses		120	1,192	1,734	777	0	0
Commercial Mortgage Backed Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		83,348		934,593
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(1,537)		(54,834)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		364,942		35,153
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(24,214)		(9,844)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		448,290		969,746
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(25,751)		(64,678)
Fixed maturity securities, available for sale, allowance for credit losses		0	0	0	2,660	0	0
Other Asset Backed Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		243,612		1,013,781
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(1,658)		(16,607)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		2,067,049		2,567,723
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(48,621)		(130,033)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		2,310,661		3,581,504
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(50,279)		(146,640)
Fixed maturity securities, available for sale, allowance for credit losses		$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
[1] Unrealized losses have not been reduced to reflect the allowance for credit losses of $14.2 million and $64.8 million as of June 30, 2021 and December 31, 2020, respectively.

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