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INCOME TAX AND DEFERRED TAX, Effective Income Tax Rate Reconciliation (Details) - ARS ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate Reconciliation [abstract] |  |  |  |  |  |
Pre-tax income |  | $ 11,429,007 | $ 5,698,116 | [1] | $ 2,208,572 | [1],[2]
Statutory income tax rate |  | 30.00% | 35.00% |  | 35.00% |
Pre-tax income at statutory income tax rate |  | $ (3,428,702) | $ (1,994,341) |  | $ (773,000) |
Tax Effects Due to [Abstract] |  |  |  |  |  |
Inflation effect | [3] | 4,432,884 | (187,006) |  | (321,584) |
Special revaluation tax |  | (1,048,000) | 0 |  | 0 |
Change in the tax rate | [4] | 0 | 2,234,656 |  | 0 |
Non-taxable income or non-deductible expenses |  | 44,482 | 428 |  | (7,693) |
Others |  | (13,835) | (660) |  | 0 |
Income tax (expense) / gain |  | $ (13,171) | $ 53,077 | [1] | $ (1,102,277) | [1],[2]
[1] | The Company has applied IFRS 15 and IFRS 9 for the first time on January 1, 2018. In accordance with the transition methods chosen, the comparative information has not been modified. See Note 4.a)
[2] | The weighted average of the number of shares considers the effect of the weighted average of the changes originated in the transactions with treasury shares made during the year.
[3] | Corresponds to the inflation effect on non-deferred tax assests and liabilities.
[4] | Corresponds to the effect of the reduction in the enacted tax rate on the net deferred tax liability according to the aforementioned.

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