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Other operating income and expenses (Tables)
 3 Months Ended
Mar. 31, 2019
Other operating income and expenses [Abstract]  
Other operating income
The table below shows the detail of Other operating income and expenses for the three-month periods ended March 31, 2019, and 2018:

Other Operating income
 
For the three-month period ended March 31,
 
  
2019
  
2018
 
  
($ in thousands)
 
Grants (see Note 16)
  
14,789
   
14,857
 
Income from various services and insurance proceeds
  
11,650
   
13,557
 
Total
  
26,439
   
28,414
 
Other operating expenses
Other Operating expenses
 
For the three-month period ended March 31,
 
  
2019
  
2018
 
  
($ in thousands)
 
Leases and fees
  
(731
)
  
(743
)
Operation and maintenance
  
(33,817
)
  
(32,444
)
Independent professional services
  
(8,833
)
  
(7,091
)
Supplies
  
(6,865
)
  
(7,391
)
Insurance
  
(6,112
)
  
(6,443
)
Levies and duties
  
(3,069
)
  
(9,909
)
Other expenses
  
(1,146
)
  
(2,173
)
Total
  
(60,573
)
  
(66,194
)