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Financial Instruments (Details)
$ in Thousands, € in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]        
Long-term debt $ 2,887,962     $ 3,206,637
Loss on euro-denominated debt (30,521) $ (6,165)    
Foreign currency translation adjustments, tax 10,682 2,158    
Net loss on net investment hedge, net of tax (19,839) $ (4,007)    
Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Notional Amount 104,133     59,932
Not Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Notional Amount 56,987     56,189
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Fair Value - Asset 665     1,058
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Accrued Expenses [Member]        
Derivatives, Fair Value [Line Items]        
Fair Value - Liability 700     $ 705
Note due 2026 [Member]        
Derivatives, Fair Value [Line Items]        
Debt Instrument, Face Amount 647,913      
Note due 2026 [Member] | Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Debt Instrument, Face Amount | €     € 600.0  
Note due 2020 [Member]        
Derivatives, Fair Value [Line Items]        
Debt Instrument, Face Amount $ 323,957      
Note due 2020 [Member] | Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Debt Instrument, Face Amount | €     € 300.0