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Financial Instruments (Details)
€ in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]            
Long-term debt $ 2,985,048   $ 2,985,048     $ 3,206,637
(Loss) gain on euro-denominated debt (58,419) $ (6,058) (124,258) $ (7,723)    
Foreign currency translation adjustments, tax 20,446 2,119 43,490 2,702    
Net (loss) gain on net investment hedge, net of tax (37,973) $ (3,939) (80,768) $ (5,021)    
Designated as Hedging Instrument [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, Notional Amount 90,647   90,647     59,932
Not Designated as Hedging Instrument [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, Notional Amount 67,243   67,243     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 428   428     1,058
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Accrued Expenses [Member]            
Derivatives, Fair Value [Line Items]            
Fair Value - Liability $ 2,252   $ 2,252     $ 705
Note due 2026 [Member]            
Derivatives, Fair Value [Line Items]            
Debt Instrument, Face Amount | €         € 600,000  
Note due 2026 [Member] | Designated as Hedging Instrument [Member]            
Derivatives, Fair Value [Line Items]            
Debt Instrument, Face Amount | €         600,000  
Note due 2020 [Member]            
Derivatives, Fair Value [Line Items]            
Debt Instrument, Face Amount | €         300,000  
Note due 2020 [Member] | Designated as Hedging Instrument [Member]            
Derivatives, Fair Value [Line Items]            
Debt Instrument, Face Amount | €         € 300,000