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INCOME TAX EXPENSE (Income tax expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Major components of tax expense (income) [Line Items]      
Current tax $ (450,384) $ (394,045) $ (234,040)
Deferred tax 106,047 (16,821) 19,463
Effect of changes in tax law on deferred income tax 7,455 2,028 3,080
Withholding tax on dividend distributions 0 (2,690) 4,177
Income tax expense $ (336,882) $ (411,528) $ (207,320)
Argentina      
Major components of tax expense (income) [Line Items]      
Applicable tax rate 25.00%    
Withholding tax rate 10.00%    
United States      
Major components of tax expense (income) [Line Items]      
Deferred income tax benefit $ 5,200    
Colombia | 2017      
Major components of tax expense (income) [Line Items]      
Applicable tax rate 42.00%    
Colombia | 2018      
Major components of tax expense (income) [Line Items]      
Applicable tax rate 43.00%    
Bottom of range | Argentina | First Two Years      
Major components of tax expense (income) [Line Items]      
Applicable tax rate 30.00%    
Bottom of range | Colombia | 2016      
Major components of tax expense (income) [Line Items]      
Applicable tax rate   39.00%  
Top of range | Argentina | First Two Years      
Major components of tax expense (income) [Line Items]      
Applicable tax rate 35.00%    
Top of range | Colombia | 2016      
Major components of tax expense (income) [Line Items]      
Applicable tax rate   40.00%