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Supplemental cash flow information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Interest $ 20,539 $ 20,212 $ 21,257
Income/withholding taxes (1) 28,654 [1] 41,455 [1] 64,622 [1]
Accrued capital costs 9,409 (683) 1,041
Iceland [Member]
      
Income/withholding taxes (1) $ 18,067 $ 22,633 $ 47,074
[1] We paid withholding taxes in Iceland of $18,067, $22,633 and $47,074 during the years ended December 31, 2013, 2012 and 2011, respectively. Our tax payments in Iceland for withholding taxes, income taxes and associated refunds are denominated in ISK.