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Supplemental cash flow information (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended
Apr. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Income Tax Examination [Line Items]      
Interest   $ 9,388 $ 9,554
Income/withholding taxes [1]   12,581 6,640
Accrued capital costs   2,570 5,107
Stock issued to settle performance unit liabilities, net of withholding taxes, value $ 1,516    
Iceland [Member]      
Income Tax Examination [Line Items]      
Income/withholding taxes   $ 8,388 $ 2,789
[1] We paid withholding taxes of $8,388 and $2,789 in Iceland on intercompany dividends during the six months ended June 30, 2015 and 2014, respectively. Our tax payments in Iceland for withholding taxes, income taxes and any associated refunds are denominated in Icelandic kronur ("ISK").