v3.10.0.1
Contracted concessional assets (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2018 and December 31, 2017 is as follows:

  
Balance as of
June 30,
  
Balance as of
December 31,
 
  
2018
  
2017
 
  
($ in thousands)
 
Contracted concessional assets cost
  
10,467,669
   
10,633,769
 
Amortization and impairment
  
(1,731,301
)
  
(1,549,499
)
Total
  
8,736,368
   
9,084,270