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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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Future cash outflow to pay for construction in progress expenditures that have occurred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
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