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Investments (Details 4) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Proceeds received from sales of fixed maturities and equity securities    
Proceeds received, Fixed maturity securities $ 110,872 $ 82,090
Proceeds received, Equity securities 5,489 6,147
Fixed maturity securities [Member]    
Proceeds received from sales of fixed maturities and equity securities    
Gross gains realized 2,489 2,476
Gross losses realized (881) (492)
Equity securities [Member]    
Proceeds received from sales of fixed maturities and equity securities    
Gross gains realized 1,048 520
Gross losses realized $ (192) $ (646)