Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Gain (Loss) on Securities [Line Items]
Credit losses (1)		$ (25,923)		$ (82,335)
Increase (decrease) in allowance for credit losses		810		(3,697)
Recovery of specific allowance		0		712
Net realized gains (losses) on investments		(22,321)	$ 4,328	(68,545)	$ (67)
Net OTTI losses recognized in operations		0	(101)	0	(1,314)
Available For Sale Fixed Maturity Securities
Gain (Loss) on Securities [Line Items]
Gross realized gains		2,843	6,164	18,296	12,590
Gross realized losses		(51)	(1,586)	(1,521)	(5,667)
Credit losses (1)	[1]	(25,923)	0	(82,335)	0
Realized gains (losses)		(23,131)	4,578	(65,560)	6,923
Other Investments
Gain (Loss) on Securities [Line Items]
Gross realized gains		0	0	0	7,296
Gross realized losses		0	0	0	(14,446)
Realized gains (losses)		0	0	0	(7,150)
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Increase (decrease) in allowance for credit losses		810	(250)	(3,697)	160
Recovery of specific allowance		0	0	712	0
Change in allowance for credit losses and recoveries		$ 810	$ (250)	$ (2,985)	$ 160

[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 $0.1 million and $1.3 million, respectively, of other than temporary impairments during the three and nine months ended September 30, 2019.