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COMMON STOCK AND DIVIDENDS, Dividends distribution and Treasury shares distribution (Details) - ARS ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |  |
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Nov. 13, 2019 | Oct. 17, 2019 | Apr. 11, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | [1] | Dec. 31, 2017 | [1]
Cash dividend [Abstract] |  |  |  |  |  |  |
Cash dividends |  |  |  | $ 0 |  |  |
Treasury shares distribution [Abstract] |  |  |  |  |  |  |
Shareholders' equity |  |  |  | 66,026,644 | $ 65,461,118 | $ 64,808,237 | $ 52,942,623
Acquisition cost of treasury shares |  |  |  | 3,715,523 | 994,866 |  |
Additional paid-up capital |  |  |  | $ 1,077,841 | $ 1,077,841 |  |
Treasury Shares [Member] |  |  |  |  |  |  |
Treasury shares distribution [Abstract] |  |  |  |  |  |  |
Distribution of ordinary shares (in pesos per share) | $ 0.0385 |  |  |  |  |  |
Distribution of shares per American Depositary Receipt (ADR) (in pesos per share) | $ 0.192 |  |  |  |  |  |
Percentage of share capital | 3.706% |  |  | 5.25% | 1.24% |  |
Shareholders' equity | $ 794,495 |  |  |  |  |  |
Market value of treasury shares | 4,394,621 |  |  |  |  |  |
Acquisition cost of treasury shares | 5,507,893 |  |  | $ 3,715,523 | $ 994,866 |  |
Additional paid-up capital |  |  |  | $ 1,077,841 | $ 1,077,841 |  |
Director [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Cash dividends |  |  | $ 433,923 |  |  |  |
Cash dividends (in pesos per share) |  |  | $ 0.5559 |  |  |  |
Shareholders [Member] |  |  |  |  |  |  |
Cash dividend [Abstract] |  |  |  |  |  |  |
Cash dividends | $ 348,981 |  | $ 12,505,672 |  |  |  |
Cash dividends (in pesos per share) | $ 0.4562 |  | $ 16.0198 |  |  |  |
Class "B" [Member] | Treasury Shares [Member] |  |  |  |  |  |  |
Treasury shares distribution [Abstract] |  |  |  |  |  |  |
Number of treasury shares in portfolio (in shares) |  | 29,444,795 |  |  |  |  |
[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)

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