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16. TAX INSTALLMENTS PROGRAMS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value measurement of liabilities [line items]    
REFIS debts and other tax installment payment plans, current R$ 20,179 R$ 21,551
REFIS debts and other tax installment payment plans, noncurrent 73,934 79,242
Federal REFIS Law 11.941/09    
Disclosure of fair value measurement of liabilities [line items]    
REFIS debts and other tax installment payment plans, current 12,100 12,552
REFIS debts and other tax installment payment plans, noncurrent 18,895 20,083
Federal REFIS Law 12.865/13    
Disclosure of fair value measurement of liabilities [line items]    
REFIS debts and other tax installment payment plans, current 6,240 5,984
REFIS debts and other tax installment payment plans, noncurrent 52,661 56,381
Other taxes in installments    
Disclosure of fair value measurement of liabilities [line items]    
REFIS debts and other tax installment payment plans, current 1,839 3,015
REFIS debts and other tax installment payment plans, noncurrent R$ 2,378 R$ 2,778