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Supplemental cash flow information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Interest | $ 19,529,000 | $ 19,511,000 | $ 18,781,000
Income/withholding taxes | 5,561,000 | 13,904,000 | 24,125,000
Accrued capital costs | 553,000 | 3,018,000 | 777,000
Iceland [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Income/withholding taxes | $ 0 | $ 0 | $ 8,388,000

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