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Supplemental cash flow information (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended
Apr. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Income Tax Examination [Line Items]      
Interest   $ 9,396 $ 9,684
Income/withholding taxes [1]   13,921 10,079
Accrued capital costs   2,155 663
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 $ 5,491
[1] We paid withholding taxes of $8,388 and $5,491 in Iceland on intercompany dividends during the nine months ended September 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").