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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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