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Investments (Details 5) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Realized investment gains (losses)        
Net realized investment gains (losses) $ 124 $ 399 $ 640 $ (689)
Other-than-temporary impairments on investments        
Other-than-temporary impairments on investments (61) 0 (182) (345)
Portion recognized in other comprehensive income 0 0 0 0
Net impairment losses recognized in earnings (61) 0 (182) (345)
Fixed maturities        
Available-for-sale securities:        
Gross realized gains 507 438 1,087 572
Gross realized losses (236) (209) (394) (1,792)
Net realized gains (losses) 271 229 693 (1,220)
Other-than-temporary impairments on investments        
Other-than-temporary impairments on investments (61) 0 (182) (345)
Equity securities        
Available-for-sale securities:        
Gross realized losses (145) 0 (145) (34)
Net realized gains (losses) (145) 0 (145) (34)
Common stock        
Trading securities:        
Gross realized gains 0 586 0 586
Decreases in fair value 0 (416) 0 (21)
Net realized gains 0 170 0 565
Other investments        
Miscellaneous:        
Gross realized gains 0 0 94 0
Gross realized losses (2) 0 (2) 0
Net realized (losses) gains $ (2) $ 0 $ 92 $ 0