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Investments (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Realized investment gains (losses)      
Net realized investment gains $ 1,334 $ 672 $ 492
Other-than-temporary impairments on investments      
Other-than-temporary impairments on fixed maturity investments recognized in earnings (182) (416) (1,558)
Other-than-temporary impairments on fixed maturity investments recognized in other comprehensive income 0 0 0
Fixed maturities      
Available-for-sale securities:      
Gross realized gains 2,996 2,111 1,571
Gross realized losses (1,611) (2,113) (1,764)
Net realized gains (losses) 1,385 (2) (193)
Other-than-temporary impairments on investments      
Other-than-temporary impairments on fixed maturity investments recognized in earnings (200) (400) (1,600)
Equity securities      
Available-for-sale securities:      
Gross realized gains 0 1 759
Gross realized losses (145) (34) (74)
Net realized gains (losses) (145) (33) 685
Common stock      
Trading securities:      
Gross realized gains 0 707 0
Net realized gains 0 707 0
Other investments      
Miscellaneous:      
Gross realized gains 96 0 0
Gross realized losses (2) 0 0
Net realized gains $ 94 $ 0 $ 0