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Salaries and social security expenses
 12 Months Ended
Dec. 31, 2017
Analysis of income and expense [abstract]  
Salaries and social security expenses
Salaries and social security expenses
 
2017
 
2016
 
2015
Wages and salaries (i)
132,025

 
117,423

 
104,216

Social security costs
30,558

 
28,849

 
23,111

Equity-settled share-based compensation
5,552

 
4,796

 
4,396

 
168,135

 
151,068

 
131,723

Number of employees
7,790

 
8,326

 
8,089

(i)
Includes US$ 41,172, US$ 28,475 and US$ 16,708, capitalized in Property, Plant and Equipment for the years 2017, 2016 and 2015, respectively.