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DEBENTURES - Amortization schedules (Details)
R$ / shares in Units, R$ in Thousands
12 Months Ended
Nov. 09, 2018
BRL (R$)
R$ / shares
Dec. 31, 2018
BRL (R$)
instrument
Dec. 31, 2017
BRL (R$)
DEBENTURES      
Debentures   R$ 1,538,873 R$ 47,928
Non-current portion of non-current notes and debentures issued   1,536,118 47,928
Year Two      
DEBENTURES      
Non-current portion of non-current notes and debentures issued   5,716  
Year Three      
DEBENTURES      
Non-current portion of non-current notes and debentures issued   18,871 5,761
Year Four      
DEBENTURES      
Non-current portion of non-current notes and debentures issued   1,501,102 21,377
Year Five      
DEBENTURES      
Non-current portion of non-current notes and debentures issued   8,080 1,333
Year Six      
DEBENTURES      
Non-current portion of non-current notes and debentures issued     14,557
More than 5 years      
DEBENTURES      
Non-current portion of non-current notes and debentures issued   R$ 2,349  
Later Than Six Years      
DEBENTURES      
Non-current portion of non-current notes and debentures issued     R$ 4,900
Debentures      
DEBENTURES      
Nominal annual interest rate (as a percent)   6.42% 9.93%
15th      
DEBENTURES      
Debentures R$ 1,500,000 R$ 1,502,755  
Quantity Issued 1,500,000 1,500,000  
Par value per debenture | R$ / shares R$ 1,000.00