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	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Hedging assets, total derivative instruments presented as cash flow hedges on the balance sheet	$ 8,406	$ 9,952
Hedging assets, gross amounts subject to master netting arrangements not offset on the balance sheet	514	603
Hedging assets, net amount	7,892	9,349
Hedging liabilities, total hedging instruments presented on the balance sheet	101,976	102,380
Hedging liabilities, gross amounts subject to master netting arrangements not offset on the balance sheet	514	603
Hedging liabilities, net amount	101,462	101,777
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Hedging liabilities, total hedging instruments presented on the balance sheet	857	603
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	5,185	8,163
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	291	0
Foreign currency exchange contracts | Accrued liabilities
Derivatives, Fair Value [Line Items]
Hedging liabilities, total hedging instruments presented on the balance sheet	538	603
Foreign currency exchange contracts | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Hedging liabilities, total hedging instruments presented on the balance sheet	319	0
Cross currency swaps | Other long-term assets
Derivatives, Fair Value [Line Items]
Hedging assets, total derivative instruments presented as cash flow hedges on the balance sheet	2,930	1,789
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	$ 101,119	$ 101,777