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Income Statement - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Profit or loss [abstract]      
Net operating income R$ 14,608,233 R$ 14,098,208 R$ 11,711,569
Cost of services (8,778,963) (9,013,120) (8,260,763)
Gross profit 5,829,270 5,085,088 3,450,806
Selling expenses (768,693) (730,047) (598,125)
Administrative income (expenses) (1,098,990) (934,896) 44,958
Other operating income (expenses), net (5,679) 4,722 143,755
Equity in results of investments in affiliaties 5,760 4,740 2,597
Profit from operations before finance income (expenses) and income tax and social contribution 3,961,668 3,429,607 3,043,991
Financial expenses (688,280) (839,891) (859,732)
Financial revenues 326,244 448,710 395,234
Exchange result, net (96,018) 1,090,628 (1,991,964)
Financial result, net (458,054) 699,447 (2,456,462)
Profit before income tax and social contribution 3,503,614 4,129,054 587,529
Income tax and social contribution      
Current (882,787) (1,121,289) (1,226)
Deferred (101,517) (60,667) (50,024)
Income tax and social contribution, total (984,304) (1,181,956) (51,250)
Profit for the year R$ 2,519,310 R$ 2,947,098 R$ 536,279
Earnings per share - basic and diluted (in reais) R$ 3.69 R$ 4.31 R$ 0.78