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Supplemental cash flow information (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Interest $ 19,066us-gaap_InterestPaid $ 20,539us-gaap_InterestPaid $ 20,212us-gaap_InterestPaid
Income/withholding taxes (1) 12,189us-gaap_IncomeTaxesPaid [1] 28,654us-gaap_IncomeTaxesPaid [1] 41,455us-gaap_IncomeTaxesPaid [1]
Accrued capital costs 744us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid 9,409us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid (683)us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid
Iceland [Member]      
Income/withholding taxes (1) $ 5,491us-gaap_IncomeTaxesPaid
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 $ 18,067us-gaap_IncomeTaxesPaid
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 $ 22,633us-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.