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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Investment Income [Line Items]        
Investment income $ 646 $ 575 $ 1,860 $ 1,687
Investment expenses (86) (70) (235) (227)
Net investment income 560 505 1,625 1,460
Fixed maturity securities        
Net Investment Income [Line Items]        
Investment income 616 551 1,772 1,614
Equity securities        
Net Investment Income [Line Items]        
Investment income 23 24 75 69
Cash and short-term investments        
Net Investment Income [Line Items]        
Investment income $ 7 $ 0 $ 13 $ 4