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Supplemental cash flow information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Interest	$ 116		$ 533
Income/withholding taxes	11,263	[1]	27,239	[1]
Iceland [Member]
Income/withholding taxes	$ 9,484		$ 26,900
[1] We paid withholding taxes in Iceland of $9,484 and $26,900 in the three months ended March 31, 2012 and 2011, respectively. Our tax payments in Iceland for withholding taxes, estimated and prepayments of Icelandic income taxes and any associated refunds are denominated in ISK.

X

- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

+ References

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X

- Definition

The amount of cash paid for interest during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 29

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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