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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Tax at federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State, net of federal benefit 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Impact of international operations 19.80%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 3.90%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (4.80%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Stock-based compensation 5.50%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 1.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 0.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Tax credits 3.80%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 1.90%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Valuation allowance 3.50%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Goodwill impairment 7.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses
Others 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Provision for income taxes (in percentage) 71.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 33.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations