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FINANCIAL INSTRUMENTS - Financial instruments per category (Details) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
FINANCIAL INSTRUMENTS    
Financial assets R$ 9,291,006 R$ 12,712,924
Financial liabilities 22,104,962 25,257,075
Financial income from assets 264,708 400,273
Financial income (expenses) from liabilities (1,408,056) (1,345,528)
Liabilities at fair value with gains and losses recognized in income    
FINANCIAL INSTRUMENTS    
Financial liabilities 1,267 6,584
Financial income (expenses) from liabilities (12,503) (58,068)
Other financial liabilities at amortized cost    
FINANCIAL INSTRUMENTS    
Financial liabilities 22,103,695 25,250,491
Financial income (expenses) from liabilities (1,395,553) (1,287,460)
Loans and receivables    
FINANCIAL INSTRUMENTS    
Financial assets 8,389,250 11,608,513
Financial income from assets 177,466 100,150
Assets at fair value with gains and losses recognized in income    
FINANCIAL INSTRUMENTS    
Financial assets 901,756 1,091,460
Financial income from assets 87,242 300,123
Assets at fair value with gains and losses recognized in shareholder's equity    
FINANCIAL INSTRUMENTS    
Financial assets   12,951
Trade accounts payable    
FINANCIAL INSTRUMENTS    
Financial liabilities 3,179,954 2,743,818
Trade accounts payable | Other financial liabilities at amortized cost    
FINANCIAL INSTRUMENTS    
Financial liabilities 3,179,954 2,743,818
Loans and Financing    
FINANCIAL INSTRUMENTS    
Financial liabilities 16,461,656 20,417,810
Loans and Financing | Other financial liabilities at amortized cost    
FINANCIAL INSTRUMENTS    
Financial liabilities 16,461,656 20,417,810
Debentures    
FINANCIAL INSTRUMENTS    
Financial liabilities 47,928 165,423
Debentures | Other financial liabilities at amortized cost    
FINANCIAL INSTRUMENTS    
Financial liabilities 47,928 165,423
FIDC Obligation    
FINANCIAL INSTRUMENTS    
Financial liabilities 1,135,077 1,007,259
FIDC Obligation | Other financial liabilities at amortized cost    
FINANCIAL INSTRUMENTS    
Financial liabilities 1,135,077 1,007,259
Other current liabilities    
FINANCIAL INSTRUMENTS    
Financial liabilities 625,410 514,599
Other current liabilities | Other financial liabilities at amortized cost    
FINANCIAL INSTRUMENTS    
Financial liabilities 625,410 514,599
Other non-current liabilities    
FINANCIAL INSTRUMENTS    
Financial liabilities 653,670 401,582
Other non-current liabilities | Other financial liabilities at amortized cost    
FINANCIAL INSTRUMENTS    
Financial liabilities 653,670 401,582
Unrealized losses on financial instruments    
FINANCIAL INSTRUMENTS    
Financial liabilities 1,267 6,584
Unrealized losses on financial instruments | Liabilities at fair value with gains and losses recognized in income    
FINANCIAL INSTRUMENTS    
Financial liabilities 1,267 6,584
Cash and cash equivalents    
FINANCIAL INSTRUMENTS    
Financial assets 2,555,338 5,063,383
Cash and cash equivalents | Loans and receivables    
FINANCIAL INSTRUMENTS    
Financial assets 2,555,338 5,063,383
Short-term investments    
FINANCIAL INSTRUMENTS    
Financial assets 821,518 1,024,411
Short-term investments | Assets at fair value with gains and losses recognized in income    
FINANCIAL INSTRUMENTS    
Financial assets 821,518 1,024,411
Unrealized gains on financial instruments    
FINANCIAL INSTRUMENTS    
Financial assets   12,951
Unrealized gains on financial instruments | Assets at fair value with gains and losses recognized in shareholder's equity    
FINANCIAL INSTRUMENTS    
Financial assets   12,951
Trade accounts receivable    
FINANCIAL INSTRUMENTS    
Financial assets 2,798,420 3,576,699
Trade accounts receivable | Loans and receivables    
FINANCIAL INSTRUMENTS    
Financial assets 2,798,420 3,576,699
Related parties    
FINANCIAL INSTRUMENTS    
Financial assets 51,839 57,541
Related parties | Loans and receivables    
FINANCIAL INSTRUMENTS    
Financial assets 51,839 57,541
Judicial deposits    
FINANCIAL INSTRUMENTS    
Financial assets 2,051,181 1,861,784
Judicial deposits | Loans and receivables    
FINANCIAL INSTRUMENTS    
Financial assets 2,051,181 1,861,784
Other current assets    
FINANCIAL INSTRUMENTS    
Financial assets 469,737 668,895
Other current assets | Loans and receivables    
FINANCIAL INSTRUMENTS    
Financial assets 469,737 668,895
Other non-current assets    
FINANCIAL INSTRUMENTS    
Financial assets 542,973 447,260
Other non-current assets | Loans and receivables    
FINANCIAL INSTRUMENTS    
Financial assets 462,735 380,211
Other non-current assets | Assets at fair value with gains and losses recognized in income    
FINANCIAL INSTRUMENTS    
Financial assets R$ 80,238 R$ 67,049