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COMMON STOCK AND DIVIDENDS, Acquisition of treasury shares (Details) - ARS ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Sep. 06, 2018
Mar. 31, 2018
Dec. 31, 2017
Acquisition of treasury shares [Abstract]        
Maximum amount invested for Shares Repurchase Program   $ 1,800,000 $ 1,700,000  
Shares Repurchase Program term 180 days      
Shares Repurchase Program expiration date Mar. 05, 2019      
Treasury Shares [Member]        
Acquisition of treasury shares [Abstract]        
Shares issued (in shares) 13,600,780     0
Percentage of total common stock representing shares repurchased 1.71%      
Acquisition cost restated to inflation amount $ 1,420,926