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PENSION PLANS (Details 3)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plans      
Type of expected yield from the plan's assets UF + 2.50% annual UF + 2.50% annual UF + 2.50% annual
Type of yield expected from the reimbursement rights UF + 2.50% annual UF + 2.50% annual UF + 2.50% annual