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29. Other operating income (expenses), net (Tables)
 12 Months Ended
Dec. 31, 2017
Other Operating Income Expenses Net Tables  
Other operating income (expenses), net
  2017 2016 2015
       
Other operating income, net 75,410 62,570 190,840
Other operating expenses (81,089) (57,848) (47,085)
       
Other operating income (expenses), net (5,679) 4,722 143,755