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Financial Instruments (Details)
€ in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]            
Long-term debt $ 2,925,472   $ 2,925,472     $ 3,206,637
(Loss) gain on euro-denominated debt (35,318) $ 4,500 (65,839) $ (1,665)    
Foreign currency translation adjustments, tax 12,362 (1,575) 23,044 583    
Net (loss) gain on net investment hedge, net of tax (22,956) $ 2,925 (42,795) $ (1,082)    
Designated as Hedging Instrument [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, Notional Amount 122,065   122,065     59,932
Not Designated as Hedging Instrument [Member]            
Derivatives, Fair Value [Line Items]            
Derivative, Notional Amount 43,482   43,482     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 242   242     1,058
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member] | Other Accrued Expenses [Member]            
Derivatives, Fair Value [Line Items]            
Fair Value - Liability $ 1,658   $ 1,658     $ 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