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Supplemental cash flow information
 3 Months Ended
Mar. 31, 2014
Supplemental Cash Flow Information [Abstract]  
Supplemental cash flow information
Supplemental cash flow information
 
Three months ended March 31,
 
2014
2013
Cash paid for:
 
 
Interest
$
131

$
108

Income/withholding taxes (1)
1,846

10,625

Non-cash investing activities:
 
 
Accrued capital costs
$
4,619

$
456

(1)
We paid withholding taxes in Iceland of $8,259 during the three months ended March 31, 2013. Our tax payments in Iceland for withholding taxes, income taxes and any associated refunds are denominated in Icelandic kronur ("ISK").