v3.8.0.1
Contracted concessional assets (Tables)
 3 Months Ended
Mar. 31, 2018
Contracted concessional assets [Abstract]  
Movements of contracted concessional assets
The detail of contracted concessional assets included in the heading ‘Contracted concessional assets’ as of March 31, 2018 and December 31, 2017 is as follows:

  
Balance as of
March 31,
  
Balance as of
December 31,
 
  
2018
  
2017
 
  
($ in thousands)
 
Contracted concessional assets cost
  
10,751,202
   
10,633,769
 
Amortization and impairment
  
(1,650,654
)
  
(1,549,499
)
Total
  
9,100,548
   
9,084,270