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Investments - Schedule of Realized Gain (Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]        
Sales proceeds $ 9,491 $ 9,491 $ 1,535
Realized gains 2 2 35
Realized losses (148) (148)
Net realized gains $ (146) $ (146) $ 35