Hedging Instruments (Schedule Of Fair Values And Balance Sheet Classifications Of Derivatives Designated As Hedging Instruments) (Details) - Derivatives designated as hedging instruments - USD ($) $ in Thousands	Jun. 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	$ 703	$ 477
Hedging assets, net amount	4,070	0
Hedging liabilities, total hedging instruments presented on the balance sheet	104,950	113,035
Hedging liabilities, gross amounts subject to master netting arrangements not offset on the balance sheet	703	477
Hedging liabilities, net amount	104,247	112,558
Cash flow hedging
Derivatives, Fair Value [Line Items]
Hedging assets, total derivative instruments presented as cash flow hedges on the balance sheet	4,773	477
Hedging liabilities, total hedging instruments presented on the balance sheet	1,360	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	2,704	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	1,755	0
Foreign currency exchange contracts | Accrued liabilities
Derivatives, Fair Value [Line Items]
Hedging liabilities, total hedging instruments presented on the balance sheet	1,304	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	56	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	314	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	$ 103,590	$ 106,567