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COMMITMENTS AND CONTINGENCIES (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Jun. 30, 2019
Oct. 31, 2017
Guarantor Obligations [Line Items]      
Amount of claim, including interest, penalties and legal fees   $ 9,100  
Principal Amount of Claim   1,000 $ 6,300
Aggregate amount of guarantees   128,036  
Restricted cash collateral   27,241  
Peru [Member]      
Guarantor Obligations [Line Items]      
Aggregate amount of guarantees   $ 118,469  
Aggregate amount $ 154,000