Investments (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Investments exceeding 10% of stockholder's equity	0	0
Gross realized gains on investments	$ 2,500	$ 8,000
Gross realized gains on sale of investments	1,500	7,200
Gross realized losses on investments	700	1,200
Gross realized losses on sale of investments	0	0
Proceeds from sale of available-for-sale securities	17,700	29,100
Other-than-temporary impairments	0	5,877
Gain (Loss) On Investments, Excluding Other Than Temporary Impairments	1,803	6,799
Securities pledged for the benefit of various state insurance departments and reinsurers	29,500	26,200
Fair value of impaired debt securities	$ 6,100	$ 4,400
Equity Securities [Member]
Number of securities with unrealized loss	20
Number of securities with unrealized loss, less than 12 months	17	4
Number of securities with unrealized loss, greater than 12 months	3
Debt Securities [Member]
Gross realized losses on investments	$ 100
Number of securities with unrealized loss	328	224
Number of securities with unrealized loss, less than 12 months	221	199
Number of securities with unrealized loss, greater than 12 months	107	25