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Financial Instruments (Details)
€ in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Derivatives, Fair Value [Line Items]        
(Loss) gain on euro-denominated debt $ (44,109) $ (30,521)    
Foreign currency translation adjustments, tax 9,263 10,682    
Net (loss) gain on net investment hedge, net of tax (34,846) $ (19,839)    
Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Notional Amount 228,603     $ 115,580
Not Designated as Hedging Instrument [Member]        
Derivatives, Fair Value [Line Items]        
Derivative, Notional Amount 90,901     59,952
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]        
Derivatives, Fair Value [Line Items]        
Fair Value - Asset 1,666     358
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Accrued Expenses [Member]        
Derivatives, Fair Value [Line Items]        
Fair Value - Liability $ 2,504     $ 2,243
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