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Investments (Details 5) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Realized investment gains (losses)    
Net realized investment gains (losses) $ 516 $ (1,088)
Other-than-temporary impairments on investments    
Other-than-temporary impairments on investments (121) (345)
Portion recognized in other comprehensive income 0 0
Net impairment losses recognized in earnings (121) (345)
Fixed maturities    
Available-for-sale securities:    
Gross realized gains 580 134
Gross realized losses (158) (1,583)
Net realized gains (losses) 422 (1,449)
Other-than-temporary impairments on investments    
Other-than-temporary impairments on investments (121) (345)
Equity securities    
Available-for-sale securities:    
Gross realized losses 0 (34)
Net realized gains (losses) 0 (34)
Common stock    
Trading securities:    
Increases in fair value 0 395
Net realized gains 0 395
Other investments    
Miscellaneous:    
Gross realized gains 94 0
Gross realized losses 0 0
Net realized gains $ 94 $ 0