Financial Instruments (Fair Value Of Derivative Instruments On Consolidated Balance Sheets) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Current Assets [Member] | Cross Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 9	$ 6,711
Other Current Assets [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	2,649	1,474
Other Non-Current Assets [Member] | Cross Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives		15,400
Accrued Expenses And Other Current Liabilities [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(8,436)	(3,723)
Accrued Expenses And Other Current Liabilities [Member] | Cross Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(67)
Accrued Expenses And Other Current Liabilities [Member] | Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(630)	(873)
Other Non-Current Liabilities [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	(16,258)	$ (10,975)
Other Non-Current Liabilities [Member] | Cross Currency Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	$ (5,104)