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DEBT (Revolving Credit Agreement) (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2017
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Line of Credit Facility, Expiration Date   Jun. 30, 2022    
Amounts due banks     $ 2,020 $ 1,758
Revolving credit agreement        
Debt Instrument [Line Items]        
Borrowing capacity under the line of credit     $ 400,000  
Credit agreement initiation date Jun. 30, 2017      
Credit facility covenant compliance     As of December 31, 2017, 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