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Other disclosures on cash flows (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Non-cash investing and financing activities

Non-cash investing and financing activities

 

     2017      2016      2015  

Transfer of assets and liabilities

      —          56,351        399,048  

Capitalization of related party transactions

      —          26,610        —