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INCOME TAX AND DEFERRED TAX, Effective Income Tax Rate Reconciliation (Details) - ARS ($)
$ in Thousands
 12 Months Ended
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