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Supplemental cash flow information
 9 Months Ended
Sep. 30, 2015
Supplemental Cash Flow Information [Abstract]  
Supplemental cash flow information
Supplemental cash flow information
 
Nine months ended September 30,
 
2015
2014
Cash paid for:
 
 
Interest
$
9,396

$
9,684

Income/withholding taxes (1)
13,921

10,079

Non-cash investing activities:
 
 
Accrued capital costs
$
2,155

$
663

(1)
We paid withholding taxes of $8,388 and $5,491 in Iceland on intercompany dividends during the nine months ended September 30, 2015 and 2014, respectively. Our tax payments in Iceland for withholding taxes, income taxes and any associated refunds are denominated in Icelandic kronur ("ISK").
In April 2015, we issued shares of common stock to certain employees to settle performance unit liabilities, net of withholding taxes of $1,516.