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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation [abstract] |  |  |  |  |
Pre-tax income |  | $ 7,690,622 | $ 22,911,548 | $ 23,935,579 |
Statutory income tax rate |  | 30.00% | 30.00% | 30.00% | 35.00%
Pre-tax income at statutory income tax rate |  | $ (2,307,187) | $ (6,873,464) | $ (7,180,674) |
Tax Effects Due to [Abstract] |  |  |  |  |
Restatement by inflation |  | 2,095,061 | 2,776,728 | 505,544 |
Unrecognized tax loss carryforward | [1] | (2,036,579) | 0 | 0 |
Special revaluation tax |  | 0 | 0 | (2,194,810) |
Adjustment affidavit previous year |  | (9,073) | 186,024 | (632) |
Tax revaluation benefit |  | 0 | 0 | 8,778,172 |
Tax inflation adjustment |  | (2,775,060) | (2,720,752) | 0 |
Others |  | 628,415 | 1,152,879 | 64,817 |
Total income tax |  | $ (4,404,423) | $ (5,478,585) | $ (27,583) |
[1] | For additional information see note 5.c

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