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DEBT (Revolving Credit Agreement) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Amounts due banks (Note 9) $ 2,623 $ 34,857
Revolving credit agreement    
Debt Instrument [Line Items]    
Borrowing capacity under the line of credit $ 400,000  
Credit facility covenant compliance As of December 31, 2020, the Company was in compliance with all of its covenants  
Debt Instrument, Term 5 years  
Additional increase in borrowing capacity of the line of credit available at the entity's option $ 100,000  
us-gaap_OtherLinesOfCredit [Member]    
Debt Instrument [Line Items]    
Borrowing capacity under the line of credit 81,785  
Line of Credit, Current $ 2,623