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Investments - Schedule of Selected Information about Sales of Fixed Maturities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]    
Proceeds from sales $ 75,299 $ 26,330
Fixed Maturities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Proceeds from sales 75,299 26,330
Gross realized gains 6,133 260
Gross realized losses $ (214) $ (354)