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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]        
Sales proceeds $ 54 $ 708 $ 13,513 $ 14,326
Realized gains 39 261 387 573
Realized losses (24) (15)
Net realized losses $ 39 $ 261 $ 363 $ 558