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TRADE AND OTHER RECEIVABLES - Roll forward for allowance on doubtful accounts (Details) - CLP ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Movement in allowance for doubtful accounts    
Opening balance $ 6,494,113 $ 6,697,156
Bad debt expense 1,629,761 2,004,958
Provision application (1,257,591) (1,708,602)
Change due to foreign exchange differences (568,075) (499,399)
Movement (195,905) (203,043)
Ending balance $ 6,298,208 $ 6,494,113