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Work in Progress, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Summary of Work in Progress

At December 31 this account comprises:

 

     2016      2017  
     Current      Non-current      Current      Non-current  

Unbilled rights receivable

      971,882        171,752        535,119        58,997  

Rights for concessions in progress

      32,078        25,834        —          28,413  

Cost of work in progress

      87,168        —          49,634        —    
  

 

 

     

 

 

     

 

 

     

 

 

  
     1,091,128        197,586        584,753        87,410  

Impairment of work in progress (Note 5.1-f)

      (410,199 )       —          —          —    
  

 

 

     

 

 

     

 

 

     

 

 

  
     680,929        197,586        584,753        87,410