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Supplemental cash flow information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Interest | $ 19,066 us-gaap_InterestPaid |  | $ 20,539 us-gaap_InterestPaid |  | $ 20,212 us-gaap_InterestPaid |
Income/withholding taxes (1) | 12,189 us-gaap_IncomeTaxesPaid | [1] | 28,654 us-gaap_IncomeTaxesPaid | [1] | 41,455 us-gaap_IncomeTaxesPaid | [1]
Accrued capital costs | 744 us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid |  | 9,409 us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid |  | (683)us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid |
Iceland [Member] |  |  |  |  |  |
Income/withholding taxes (1) | $ 5,491 us-gaap_IncomeTaxesPaid / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  | $ 18,067 us-gaap_IncomeTaxesPaid / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  | $ 22,633 us-gaap_IncomeTaxesPaid / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |
[1] | We paid withholding taxes in Iceland on intercompany dividends of $5,491, $18,067 and $22,633 during the years ended December 31, 2014, 2013 and 2011, respectively. Our tax payments in Iceland for withholding taxes, income taxes and any associated refunds are denominated in ISK.

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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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