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Income taxes Significant components of Income tax expense (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal current expense (benefit) $ (112)us-gaap_CurrentFederalTaxExpenseBenefit $ 532us-gaap_CurrentFederalTaxExpenseBenefit $ (161)us-gaap_CurrentFederalTaxExpenseBenefit
State current expense (benefit) 2,252us-gaap_CurrentStateAndLocalTaxExpenseBenefit (445)us-gaap_CurrentStateAndLocalTaxExpenseBenefit (669)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign current expense 15,098us-gaap_CurrentForeignTaxExpenseBenefit 6,198us-gaap_CurrentForeignTaxExpenseBenefit 9,808us-gaap_CurrentForeignTaxExpenseBenefit
Total current expense 17,238us-gaap_CurrentIncomeTaxExpenseBenefit 6,285us-gaap_CurrentIncomeTaxExpenseBenefit 8,978us-gaap_CurrentIncomeTaxExpenseBenefit
U.S. federal deferred benefit (1,696)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (3,905)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (1,564)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State deferred benefit (12)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (207)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Foreign deferred tax expense 2,778us-gaap_DeferredForeignIncomeTaxExpenseBenefit 958us-gaap_DeferredForeignIncomeTaxExpenseBenefit 1,496us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred benefit 1,070us-gaap_DeferredIncomeTaxExpenseBenefit (3,154)us-gaap_DeferredIncomeTaxExpenseBenefit (68)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense $ 18,308us-gaap_IncomeTaxExpenseBenefit $ 3,131us-gaap_IncomeTaxExpenseBenefit $ 8,910us-gaap_IncomeTaxExpenseBenefit