Hedging Instruments (Schedule Of Fair Values And Balance Sheet Classifications Of Derivatives Designated As Hedging Instruments) (Details) - Derivatives and non-derivatives designated as hedging instruments - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Hedging assets, gross amounts subject to master netting arrangements not offset on the balance sheet	$ 419	$ 477
Hedging assets, net amount	5,537	0
Hedging liabilities, total hedging instruments presented on the balance sheet	103,605	113,035
Hedging liabilities, gross amounts subject to master netting arrangements not offset on the balance sheet	419	477
Hedging liabilities, net amount	103,186	112,558
Cash flow hedging
Derivatives, Fair Value [Line Items]
Hedging assets, total derivative instruments presented as cash flow hedges on the balance sheet	5,956	477
Hedging liabilities, total hedging instruments presented on the balance sheet	744	6,468
Foreign currency exchange contracts | Other current assets
Derivatives, Fair Value [Line Items]
Hedging assets, total derivative instruments presented as cash flow hedges on the balance sheet	4,469	477
Foreign currency exchange contracts | Other long-term assets
Derivatives, Fair Value [Line Items]
Hedging assets, total derivative instruments presented as cash flow hedges on the balance sheet	1,339	0
Foreign currency exchange contracts | Accrued liabilities
Derivatives, Fair Value [Line Items]
Hedging liabilities, total hedging instruments presented on the balance sheet	681	6,468
Foreign currency exchange contracts | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Hedging liabilities, total hedging instruments presented on the balance sheet	63	0
Cross currency swaps | Other current assets
Derivatives, Fair Value [Line Items]
Hedging assets, total derivative instruments presented as cash flow hedges on the balance sheet	148	0
Foreign currency borrowings designated as net investment hedge on the balance sheet | Long-term debt
Derivatives, Fair Value [Line Items]
Hedging liabilities, total hedging instruments presented on the balance sheet	$ 102,861	$ 106,567