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22. EXPENSES BY NATURE (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Other operating expenses R$ (646,944) R$ (1,076,730) R$ (1,341,191)
Depreciation, amortization and depletion      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Production costs 1,376,862 1,241,425  
Sales expenses 8,851 9,163  
General and Administrative Expenses 23,052 28,228  
Depreciation, amortization and depletion (1,408,765) (1,278,816)  
Other operating expenses 44,570 43,681  
Total R$ 1,453,335 R$ 1,322,497