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Supplemental cash flow information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Interest | $ 18,781 | $ 19,066 | $ 20,539
Income/withholding taxes | 24,125 | 12,189 | 28,654
Accrued capital costs | 777 | 744 | 9,409
Iceland [Member] |  |  |
Income/withholding taxes | $ 8,388 | $ 5,491 | $ 18,067

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