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Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gain (Loss) on Securities [Line Items]
Credit losses (1)										$ (94,560)
Increase in allowance for credit losses										(15,447)
Recovery of specific allowance										712
Net realized gains (losses) on investments		$ (12,135)	$ (22,321)	$ (25,888)	$ (20,336)	$ 7,029	$ 4,328	$ (3,832)	$ (563)	(80,680)	$ 6,962	$ (37,178)
Available For Sale Fixed Maturity Securities
Gain (Loss) on Securities [Line Items]
Gross realized gains										305,170	21,449	12,245
Gross realized losses										(276,847)	(6,397)	(47,974)
Credit losses (1)	[1]									(94,560)	0	0
Realized gains (losses)										(66,237)	15,052	(35,729)
Other Investments
Gain (Loss) on Securities [Line Items]
Gross realized gains										0	7,296	0
Gross realized losses										0	(14,446)	0
Realized gains (losses)										0	(7,150)	0
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Increase in allowance for credit losses										(15,447)	(940)	(3,165)
Recovery of specific allowance										712	0	1,592
Gain on sale of mortgage loans										292	0	124
Change in allowance for credit losses and recoveries										$ (14,443)	$ (940)	$ (1,449)
[1] (1) Prior to adopting authoritative guidance effective January 1, 2020, credit losses on available for sale fixed maturity securities were classified as other than temporary impairments and reported in a separate line item in the Consolidated statements of operations. We recognized $18.7 million and $36.7 million, respectively, of other than temporary impairments during the years ended December 31, 2019 and 2018.

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