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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net Investment Income [Line Items]        
Investment income $ 600 $ 556 $ 1,214 $ 1,112
Investment expenses (72) (87) (149) (157)
Net investment income 528 469 1,065 955
Fixed maturity securities        
Net Investment Income [Line Items]        
Investment income 570 532 1,156 1,063
Equity securities        
Net Investment Income [Line Items]        
Investment income 25 22 51 45
Cash and short-term investments        
Net Investment Income [Line Items]        
Investment income $ 5 $ 2 $ 7 $ 4