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CASH AND CASH EQUIVALENTS - Time deposits (Details) - CLP ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalent [Line items]    
Time Deposit $ 1,500,315 $ 10,616,688
Banco Santander 2.52 percent 12-29-2017 | Chilean pesos    
Cash and cash equivalent [Line items]    
Principal $ 7,500,000  
Annual rate 2.52%  
Time Deposit   7,516,275
Banco Santander 2.40 Percent 2,700,000 Principal Amount 12-29-2017 | Chilean pesos    
Cash and cash equivalent [Line items]    
Principal $ 2,700,000  
Annual rate 2.40%  
Time Deposit   2,700,360
Banco Santander 2.40 Percent 400,000 Principal Amount 12-29-2017 | Chilean pesos    
Cash and cash equivalent [Line items]    
Principal $ 400,000  
Annual rate 2.40%  
Time Deposit   $ 400,053
Banco Santander 2.52 Percent 700,000 Principal Amount 12-28-2018 | Chilean pesos    
Cash and cash equivalent [Line items]    
Principal $ 700,000  
Annual rate 2.52%  
Time Deposit $ 700,147  
Banco Santander 2.52 Percent 800,000 Principal Amount 12-28-2018 | Chilean pesos    
Cash and cash equivalent [Line items]    
Principal $ 800,000  
Annual rate 2.52%  
Time Deposit $ 800,168