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Other operating expenses (Tables)
 3 Months Ended
Mar. 31, 2018
Other operating expenses [Abstract]  
Other operating expenses
The table below shows the detail of Other operating expenses for the three-month periods ended March 31, 2018, and 2017:

Other Operating expenses
 
For the three-month period ended March 31,
 
  
2018
  
2017
 
  
($ in thousands)
 
Leases and fees
  
(743
)
  
(1,726
)
Operation and maintenance
  
(32,444
)
  
(25,897
)
Independent professional services
  
(7,091
)
  
(2,230
)
Supplies
  
(7,391
)
  
(7,176
)
Insurance
  
(6,443
)
  
(5,928
)
Levies and duties
  
(9,909
)
  
(9,688
)
Other expenses
  
(2,173
)
  
(1,770
)
Total
  
(66,194
)
  
(54,415
)