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TRADE AND OTHER ACCOUNTS RECEIVABLE CURRENT, AND NON-CURRENT ACCOUNTS RECEIVABLE (Details 4) - Accumulated Impairment [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of reconciliation of changes in goodwill [line items]      
Opening balance $ (77,054) $ (60,072) $ (71,042)
Write-offs 8,249 20,910 10,120
(Increase) Decrease (19,104) (37,892) 850
Closing balance $ (87,909) $ (77,054) $ (60,072)