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Supplemental cash flow information (Tables) | 6 Months Ended
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Jun. 30, 2014
Supplemental Cash Flow Information [Abstract] |
Supplemental cash flow information |
| Six months ended June 30,
| 2014 | 2013
Cash paid for: |  |
Interest | $ | 9,554 |  | $ | 11,287 |
Income/withholding taxes (1) | 6,640 |  | 14,156 |
Non-cash investing activities: |  |
Accrued capital costs | $ | 5,107 |  | $ | 321 |
(1) | We paid withholding taxes in Iceland on intercompany dividends of $2,789 and $8,259 during the six months ended June 30, 2014 and 2013, respectively. Our tax payments in Iceland for withholding taxes, income taxes and any associated refunds are denominated in Icelandic kronur ("ISK").

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