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Supplemental cash flow information
 6 Months Ended
Jun. 30, 2015
Supplemental Cash Flow Information [Abstract]  
Supplemental cash flow information
Supplemental cash flow information
 
Six months ended June 30,
 
2015
2014
Cash paid for:
 
 
Interest
$
9,388

$
9,554

Income/withholding taxes (1)
12,581

6,640

Non-cash investing activities:
 
 
Accrued capital costs
$
2,570

$
5,107

(1)
We paid withholding taxes of $8,388 and $2,789 in Iceland on intercompany dividends during the six months ended June 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.