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INVESTMENTS - (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments rollforward      
Proceeds from sale of investments $ 1,266 $ 6,769 $ 2,895
Cost of purchase of marketable equity securities   1,300  
Marketable equity securities      
Investments rollforward      
Proceeds from sale of investments $ 1,300 $ 6,800 $ 2,900