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MARKETABLE SECURITIES (Schedule of Company's debt marketable securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]      
Due within one year $ 21,652    
1 to 2 years    
Total $ 21,652 $ 40,966 $ 56,662