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Supplemental cash flow information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Interest | $ 131 | $ 108
Income/withholding taxes (1) | 1,846 | 10,625
Accrued capital costs | 4,619 | 456
Iceland [Member] |  |
Income/withholding taxes (1) |  | $ 8,259

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