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Income Taxes Unrecognized Tax Benefits Narrative (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]      
Unrecognized Tax Benefits 27,200,000us-gaap_UnrecognizedTaxBenefits $ 31,570,000us-gaap_UnrecognizedTaxBenefits $ 21,730,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 21,200,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 25,700,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 2,200,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued $ 1,800,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Minimum [Member]      
Income Tax Contingency [Line Items]      
Open Tax Year 2013    
Maximum [Member]      
Income Tax Contingency [Line Items]      
Open Tax Year 2002    
Foreign Tax Authority [Member]      
Income Tax Contingency [Line Items]      
Income Tax Examinations, Number 2trs_IncomeTaxExaminationsNumber
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember