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Net Financial Result (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net Financial Result      
Income from financial investments R$ 442,378 R$ 285,888 R$ 333,168
Other financial income 17,329 19,890 48,636
Total financial income 459,707 305,778 381,804
Loan interest expenses (1,075,567) (1,035,986) (991,796)
Other interest expenses (120,991) (108,410) (104,023)
Other financial expenses (303,816) (74,080) (60,385)
Total financial expenses (1,500,374) (1,218,476) (1,156,204)
Monetary and exchange variations on loans and financing (1,311,061) (163,418) 1,619,202
Monetary and exchange variations on other assets and liabilities 244,411 (15,995) (251,921)
Monetary and exchange variation, net (1,066,650) (179,413) 1,367,281
Derivative gain (loss) (2,735,196) 73,271 528,839
Financial income (459,707) (379,049) (2,277,924)
Financial expenses (5,302,220) (1,397,889) (1,156,204)
Financial result, net R$ (4,842,513) R$ (1,018,840) R$ 1,121,720