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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2020
Oct. 31, 2017
Guarantor Obligations [Line Items]        
Amount of claim, including interest, penalties and legal fees     $ 6,400  
Principal Amount of Claim     739 $ 6,300
Aggregate amount of guarantees     108,900  
Restricted cash collateral     25,696  
Subsidiary [Member]        
Guarantor Obligations [Line Items]        
Arbitration award amount $ 400      
Reduction of costs in cost of revenues $ 3,260      
Peru [Member]        
Guarantor Obligations [Line Items]        
Aggregate amount of guarantees     $ 106,373  
Aggregate amount   $ 154,000