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Supplemental cash flow information
 3 Months Ended
Mar. 31, 2015
Supplemental Cash Flow Information [Abstract]  
Supplemental cash flow information
Supplemental cash flow information
 
Three months ended March 31,
 
2015
2014
Cash paid for:
 
 
Interest
$
5

$
131

Income/withholding taxes (1)
1,142

1,846

Non-cash investing activities:
 
 
Accrued capital costs
$
1,202

$
4,619

(1)
Our tax payments in Iceland for withholding taxes, income taxes and any associated refunds are denominated in Icelandic kronur ("ISK").