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Investments (Details 5) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Realized investment gains (losses)        
Net realized investment gains $ 899 $ 718 $ 1,539 $ 29
Other-than-temporary impairments on investments        
Other-than-temporary impairments on investments 0 0 (182) (345)
Portion recognized in other comprehensive income 0 0 0 0
Net impairment losses recognized in earnings 0 0 (182) (345)
Fixed maturities        
Available-for-sale securities:        
Gross realized gains 1,621 603 2,708 1,175
Gross realized losses (722) (27) (1,116) (1,819)
Net realized gains (losses) 899 576 1,592 (644)
Other-than-temporary impairments on investments        
Other-than-temporary impairments on investments 0 0 (182) (345)
Equity securities        
Available-for-sale securities:        
Gross realized losses 0 0 (145) (34)
Net realized gains (losses) 0 0 (145) (34)
Common stock        
Trading securities:        
Gross realized gains 0 121 0 707
Increases in fair value 0 21 0 0
Net realized gains 0 142 0 707
Other investments        
Miscellaneous:        
Gross realized gains 0 0 94 0
Gross realized losses 0 0 (2) 0
Net realized gains $ 0 $ 0 $ 92 $ 0