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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% |

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