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CURRENT AND DEFERRED TAXES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Major components of tax expense (income) [abstract]    
Provisional monthly payments (advances), current assets $ 65,257 $ 43,821
Provisional monthly payments (advances), non-current assets
Provisional monthly payments (advances) 65,257 43,821
Other recoverable credits, current assets 12,730 21,556
Other recoverable credits, non-current assets 17,532 20,272
Other recoverable credits 30,262 41,828
Total assets by current tax, current assets 77,987 65,377
Total assets by current tax, non-current assets 17,532 20,272
Total assets by current tax $ 95,519 $ 85,649