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Investments (Gross Unrealized Losses on Investments, By Category and Length of Time) (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 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		$ 966,046		$ 2,992,944
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(10,254)		(122,908)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		2,634,534		2,771,976
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(81,791)		(192,689)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		3,600,580		5,764,920
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(92,045)		(315,597)
Fixed maturity securities, available for sale, allowance for credit losses		4,074	$ 14,190	64,771	$ 61,619	$ 50,186	$ 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		1,019
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(24)
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		1,019
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(24)
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		40,043		31,802
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(582)		(3,887)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		23,961		868
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(3,378)		(1)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		64,004		32,670
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(3,960)		(3,888)
Fixed maturity securities, available for sale, allowance for credit losses		2,772	3,347	2,844	0	0	0
Corporate Securities
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, fair value		419,976		606,277
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(6,997)		(45,150)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		164,005		154,633
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(8,527)		(50,935)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		583,981		760,910
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(15,524)		(96,085)
Fixed maturity securities, available for sale, allowance for credit losses		1,006	10,723	60,193	53,045	46,749	0
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		83,291		156,016
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(455)		(2,384)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		40,947		13,599
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(1,999)		(1,876)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		124,238		169,615
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(2,454)		(4,260)
Fixed maturity securities, available for sale, allowance for credit losses		296	120	1,734	1,221	777	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		56,781		934,593
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(354)		(54,834)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		349,533		35,153
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(23,051)		(9,844)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		406,314		969,746
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(23,405)		(64,678)
Fixed maturity securities, available for sale, allowance for credit losses		0	0	0	7,353	2,660	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		364,936		1,013,781
Fixed maturity securities, available for sale, continuous unrealized loss position, less than 12 months, unrealized losses	[1]	(1,842)		(16,607)
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, fair value		2,056,088		2,567,723
Fixed maturity securities, available for sale, continuous unrealized loss position, 12 months or more, unrealized losses	[1]	(44,836)		(130,033)
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, fair value		2,421,024		3,581,504
Fixed maturity securities, available for sale securities, continuous unrealized loss position, total, unrealized losses	[1]	(46,678)		(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 $4.1 million and $64.8 million as of September 30, 2021 and December 31, 2020, respectively.

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