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Investments (Net Realized Gains (Losses) on Invesments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on investments, excluding other than temporary impairment (OTTI) losses	$ 7,029	$ 4,328	$ (3,832)	$ (563)	$ 3,097	$ (2,196)	$ (38,381)	$ 302	$ 6,962	$ (37,178)	$ 10,509
Fixed Maturity Securities
Gain (Loss) on Securities [Line Items]
Gross realized gains									21,449	12,245	18,254
Gross realized losses									(6,397)	(47,974)	(9,058)
Gross realized gains (losses), excluding other than temporary impairment									15,052	(35,729)	9,196
Equity Securities
Gain (Loss) on Securities [Line Items]
Gross realized gains									0	0	348
Other Investments
Gain (Loss) on Securities [Line Items]
Gross realized gains									7,296	0	0
Gross realized losses									(14,446)	0	0
Gain on sale of real estate									0	0	56
Gross realized gains (losses), excluding other than temporary impairment									(7,150)	0	56
Mortgage Loans on Real Estate
Gain (Loss) on Securities [Line Items]
Decrease (increase) in allowance for credit losses									(940)	(3,165)	278
Recovery of specific allowance									0	1,592	631
Gain on sale of mortgage loans									0	124	0
Change in allowance for credit losses and recoveries									$ (940)	$ (1,449)	$ 909

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