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Supplemental cash flow information
 12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]  
Supplemental cash flow information
Supplemental cash flow information
 
Year Ended December 31,
 
2015
 
2014
 
2013
Cash paid for:
 
 
 

 
 
Interest
$
18,781

 
$
19,066

 
$
20,539

Income/withholding taxes (1)
24,125

 
12,189

 
28,654

Non-cash investing activities:
 

 
 

 
 

Accrued capital costs
$
777

 
$
744

 
$
9,409


(1)
We paid withholding taxes in Iceland on intercompany dividends of $8,388, $5,491 and $18,067 during the years ended December 31, 2015, 2014 and 2013, respectively. Such withholding taxes are then refunded to us in the following year.