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Cash and cash equivalents (Tables)
12 Months Ended
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]  
Disclosure of cash and cash equivalents
 
2017
 
2016
Cash at bank and on hand
118,358

 
130,001

Short-term bank deposits
150,837

 
28,567

 
269,195

 
158,568