Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Gain (Loss) on Securities [Line Items]
Credit losses (1)		$ (25,041)		$ (56,412)
Increase (decrease) in allowance for credit losses		(2,510)		(4,507)
Recovery of specific allowance		712		712
Net realized gains (losses) on investments		(25,888)	$ (3,832)	(46,224)	$ (4,395)
Available For Sale Fixed Maturity Securities
Gain (Loss) on Securities [Line Items]
Gross realized gains		1,215	5,255	15,453	6,426
Gross realized losses		(264)	(2,287)	(1,470)	(4,081)
Credit losses (1)	[1]	(25,041)	0	(56,412)	0
Realized gains (losses)		(24,090)	2,968	(42,429)	2,345
Other Investments
Gain (Loss) on Securities [Line Items]
Gross realized gains		0	7,296	0	7,296
Gross realized losses		0	(14,446)	0	(14,446)
Realized gains (losses)		0	(7,150)	0	(7,150)
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Increase (decrease) in allowance for credit losses		(2,510)	350	(4,507)	410
Recovery of specific allowance		712	0	712	0
Change in allowance for credit losses and recoveries		$ (1,798)	$ 350	$ (3,795)	$ 410

[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 $1.2 million of other than temporary impairments during the three and six months ended June 30, 2019.