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Interest expense
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
Interest expense
Interest expense
 
The balances in interest expense are as follows:
 
 
2017
 
2016
 
2015
Year ended December 31,
 
$’000
 
$’000
 
$’000
 
 
 
 
 
 
 
Interest expense on long-term debt and obligations under capital lease
 
29,425

 
27,090

 
27,380

 
 
 
 
 
 
 
Withholding tax provision classified as interest
 
—

 
—

 
(1,476
)
 
 
 
 
 
 
 
Interest on legal settlements
 
(28
)
 
(979
)
 
3,294

 
 
 
 
 
 
 
Amortization of debt issuance costs and discount on secured term loan
 
3,682

 
3,044

 
2,903

 
 
 
 
 
 
 
Interest capitalized
 
(624
)
 
—

 
—

 
 
 
 
 
 
 
Total interest expense
 
32,455

 
29,155

 
32,101