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INTANGIBLE ASSETS - Changes in intangible assets by type (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
INTANGIBLE ASSETS      
Other intangible assets at beginning of period R$ 972,089 R$ 1,319,941 R$ 1,835,761
Foreign exchange effect 107,434 7,666 (208,785)
Acquisition 67,388 37,939 54,044
Disposal (3,879) (27,652) (15,195)
Amortization (306,936) (285,197) (318,135)
Effect of selling of subsidiary     (27,749)
Assets held for sale   (80,608)  
Other intangible assets at end of period 836,096 972,089 1,319,941
Supplier relationships      
INTANGIBLE ASSETS      
Other intangible assets at beginning of period 32,786 39,726 47,571
Amortization (6,067) (6,940) (7,845)
Other intangible assets at end of period 26,719 32,786 39,726
Software development      
INTANGIBLE ASSETS      
Other intangible assets at beginning of period 490,829 636,605 808,482
Foreign exchange effect 28,598 2,947 (60,464)
Acquisition 67,388 37,939 40,643
Disposal (3,791)   (2,145)
Amortization (167,384) (149,150) (149,911)
Assets held for sale   (37,512)  
Other intangible assets at end of period R$ 415,640 490,829 636,605
Estimated useful lives 7 years    
Customers contracts and relationships      
INTANGIBLE ASSETS      
Other intangible assets at beginning of period R$ 440,774 615,608 911,483
Foreign exchange effect 77,593 3,835 (140,812)
Disposal (88) (27,652)  
Amortization (130,980) (125,621) (155,063)
Assets held for sale   (25,396)  
Other intangible assets at end of period 387,299 440,774 615,608
Others      
INTANGIBLE ASSETS      
Other intangible assets at beginning of period 7,700 28,002 68,225
Foreign exchange effect 1,243 884 (7,509)
Acquisition     13,401
Disposal     (13,050)
Amortization (2,505) (3,486) (5,316)
Effect of selling of subsidiary     (27,749)
Assets held for sale   (17,700)  
Other intangible assets at end of period R$ 6,438 R$ 7,700 R$ 28,002
Estimated useful lives 5 years    
Minimum | Supplier relationships      
INTANGIBLE ASSETS      
Estimated useful lives 5 years    
Minimum | Customers contracts and relationships      
INTANGIBLE ASSETS      
Estimated useful lives 5 years    
Maximum | Supplier relationships      
INTANGIBLE ASSETS      
Estimated useful lives 20 years    
Maximum | Customers contracts and relationships      
INTANGIBLE ASSETS      
Estimated useful lives 20 years