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Schedule of Realized Gain (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Schedule of Investments [Abstract]        
Sales proceeds $ 9,491 $ 44,508 $ 9,491
Realized gains 2 1,772 2
Realized losses (148) (2) (148)
Net realized losses $ (146) $ 1,770 $ (146)