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Investments (Details 5) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Realized investment gains (losses)      
Net realized investment gains $ 492 $ 1,057 $ 945
Other-than-temporary impairments on investments      
Other -than-temporary impairments on investments (1,558) (105) (388)
Portion recognized in other comprehensive income 0 0 0
Net impairment losses recognized in earnings (1,558) (105) (388)
Fixed maturities      
Available-for-sale securities:      
Gross realized gains 1,571 453 890
Gross realized losses (1,764) (333) (43)
Net realized gains (losses) (193) 120 847
Other-than-temporary impairments on investments      
Other -than-temporary impairments on investments (1,558) (105) (388)
Equity securities      
Available-for-sale securities:      
Gross realized gains 759 1,132 391
Gross realized losses (74) (195) (293)
Net realized gains (losses) $ 685 $ 937 $ 98