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Supplemental cash flow information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Interest | $ 19,511 | $ 18,781 | $ 19,066
Income/withholding taxes | 13,904 | 24,125 | 12,189
Accrued capital costs | 3,018 | 777 | 744
Iceland [Member] |  |  |
Income/withholding taxes | $ 0 | $ 8,388 | $ 5,491

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