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Schedule of Realized Gain (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule of Investments [Abstract]        
Sales proceeds $ 1,878 $ 15,224 $ 44,508
Realized gains 33 1,108 1,772
Realized losses (2)
Net realized gains $ 33 $ 1,108 $ 1,770