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Investments - Schedule of Selected Information about Sales of Fixed Maturities (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]    
Proceeds from sales $ 51,299 $ 14,287
Fixed Maturities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Proceeds from sales 51,299 14,287
Gross realized gains 3,556 82
Gross realized losses $ (214) $ (104)