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Supplemental cash flow information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Summary of supplemental cash flow information
 
Year Ended December 31,
 
2017
 
2016
 
2015
Cash paid for:
 
 
 

 
 
Interest
$
19,529

 
$
19,511

 
$
18,781

Income/withholding taxes, net (1)
5,561

 
13,904

 
24,125

Non-cash investing and financing activities:
 

 
 
 
 

Accrued capital costs
$
553

 
$
3,018

 
$
777

(1) 
We paid withholding taxes in Iceland on intercompany dividends of $8,388 during the year ended December 31, 2015 (there were none for the years ended December 31, 2017 and 2016). Such withholding taxes are then refunded to us in the following year.