Financial Instruments (Fair Value Of Derivative Instruments On Consolidated Balance Sheets) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other current assets [Member] | Cross Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 1,331	$ 6,711
Other current assets [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	2,107	1,474
Other Assets [Member] | Cross Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	5,631	15,400
Accrued expenses and other current liabilities [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(8,369)	(3,723)
Accrued expenses and other current liabilities [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(1,979)	(873)
Other Noncurrent Liabilities [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	$ (18,011)	$ (10,975)