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Investments (Details 4) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Investment income from portfolios    
Total investment income $ 6,457 $ 4,885
Less: investment expenses 479 223
Net investment income 5,978 4,662
Fixed maturities    
Investment income from portfolios    
Total investment income 5,904 4,526
Equity securities    
Investment income from portfolios    
Total investment income 32 35
Cash equivalents and other    
Investment income from portfolios    
Total investment income $ 521 $ 324