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Schedule of Realized Gain (loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Investments [Abstract]      
Sales proceeds $ 61,163 $ 15,318 $ 21,126
Realized gains 2,449 2 84
Realized losses (1) (179) (64)
Net realized gains $ 2,448 $ (177) $ 20