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Work in Progress, Net (Tables)
 12 Months Ended
Dec. 31, 2018
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Summary of Work in Progress

At December 31 this account comprises:

 

     2017      2018  
     Current      Non-current      Current      Non-current  

Unbilled receivable concessions in progress

      —          28,413        —          32,212  

Work in Progress

      61,804        —          28,538        —    
  

 

 

     

 

 

     

 

 

     

 

 

  
     61,804        28,413        28,538        32,212