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Supplemental cash flow information (Tables)
 12 Months Ended
Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information
 
Year Ended December 31,
 
2014
2013
2012
Cash paid for:
 
 

 
Interest
$
19,066

$
20,539

$
20,212

Income/withholding taxes (1)
12,189

28,654

41,455

Non-cash investing activities:
 

 

 

Accrued capital costs
$
744

$
9,409

$
(683
)

(1)
We paid withholding taxes in Iceland on intercompany dividends of $5,491, $18,067 and $22,633 during the years ended December 31, 2014, 2013 and 2011, respectively. Our tax payments in Iceland for withholding taxes, income taxes and any associated refunds are denominated in ISK.