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Trade receivables and accrued revenue (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Trade Receivables and Accrued Income
     31 December
2017		      31 December
2016		  

Receivables from subscribers

      1,369,948        1,223,183  

Undue assigned contracted receivables

      347,596        1,215,314  

Accrued revenue

      632,631        558,169  

Accounts and notes receivable

      498,397        293,238  
  

 

 

     

 

 

  
     2,848,572        3,289,904