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28. Financial Income (Expense) (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financial Income Expense Details      
Interest on financial investments R$ 475,460 R$ 404,080 R$ 341,739
Interest from customers 105,773 103,976 81,374
Other financial income 3,868 5,187 3,316
Financial income 585,101 513,243 426,429
Interest on loans (672,102) (777,424) (666,791)
Interest on debentures (385,009) (374,125) (308,290)
Interest on finance leases (4,991) (7,839) (4,023)
Bank charges, financial transactions tax, and other charges (91,614) (74,761) (46,966)
Exchange variation, net of gains and losses with derivative instruments 72,869 (69,854) (71,384)
Reversal of provision – ICMS from PIS and COFINS tax bases (see Note 20.a.1.2) 43,411 0 0
Changes in subscription warranty—indemnification (see Note 22) (20,360) (42,615) (21,154)
TCC monetary restatement – Bahiana (see Notes 20.b.2.2 and 27) (13,509) 0 0
Monetary restatement of provisions, net, and other financial expenses 11,908 (9,201) (11,159)
Financial expense (1,059,397) (1,355,819) (1,129,767)
Financial income (expense) R$ (474,296) R$ (842,576) R$ (703,338)