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	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Hedging assets, total derivative instruments presented as cash flow hedges on the balance sheet	$ 10,996	$ 9,952
Hedging assets, gross amounts subject to master netting arrangements not offset on the balance sheet	74	603
Hedging assets, net amount	10,922	9,349
Hedging liabilities, total hedging instruments presented on the balance sheet	99,905	102,380
Hedging liabilities, gross amounts subject to master netting arrangements not offset on the balance sheet	74	603
Hedging liabilities, net amount	99,831	101,777
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Hedging liabilities, total hedging instruments presented on the balance sheet	74	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	7,127	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	199	0
Foreign currency exchange contracts | Accrued liabilities
Derivatives, Fair Value [Line Items]
Hedging liabilities, total hedging instruments presented on the balance sheet	59	603
Foreign currency exchange contracts | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Hedging liabilities, total hedging instruments presented on the balance sheet	15	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	3,670	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	$ 99,831	$ 101,777