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Income Taxes (Components of income tax expense and income before taxes, by jurisdiction) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Geographic sources of income (loss) before income taxes      
United States $ 16,571us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (36,829)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 17,062us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign 119,507us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 160,816us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 37,049us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Total income before income taxes 136,078us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 123,987us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 54,111us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Components of the provision (benefit) for income taxes      
Current federal tax expense 0us-gaap_CurrentFederalTaxExpenseBenefit 0us-gaap_CurrentFederalTaxExpenseBenefit 0us-gaap_CurrentFederalTaxExpenseBenefit
Current state tax (benefit) expense (46)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit (75)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current foreign tax expense 51,081us-gaap_CurrentForeignTaxExpenseBenefit 30,902us-gaap_CurrentForeignTaxExpenseBenefit 10,998us-gaap_CurrentForeignTaxExpenseBenefit
Current income tax expense 51,035us-gaap_CurrentIncomeTaxExpenseBenefit 30,902us-gaap_CurrentIncomeTaxExpenseBenefit 10,923us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred federal tax expense 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit (8,556)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 1,859us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred state tax expense 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 9us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 266us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred foreign tax expense (benefit) (17,190)us-gaap_DeferredForeignIncomeTaxExpenseBenefit 291us-gaap_DeferredForeignIncomeTaxExpenseBenefit 3,953us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) (17,190)us-gaap_DeferredIncomeTaxExpenseBenefit (8,256)us-gaap_DeferredIncomeTaxExpenseBenefit 6,078us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense $ 33,845us-gaap_IncomeTaxExpenseBenefit $ 22,646us-gaap_IncomeTaxExpenseBenefit $ 17,001us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent 24.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations 18.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 31.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations