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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]        
Sales proceeds $ 19,591 $ 54 $ 21,125 $ 13,513
Realized gains 49 39 84 387
Realized losses (64) (64) (24)
Net realized losses $ (15) $ 39 $ 20 $ 363