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Supplemental cash flow information (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Interest $ 9,554 $ 11,287
Income/withholding taxes (1) 6,640 [1] 14,156 [1]
Accrued capital costs 5,107 321
Iceland [Member]
    
Income/withholding taxes (1) $ 2,789 $ 8,259
[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").