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Long-term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 15, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt	$ 1,008,516		$ 1,139,287
Current portion of long-term debt	0		349,434
Long-term Debt, Noncurrent	$ 1,008,516		$ 789,853
2.70% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	2.70%		2.70%
Long-term debt	$ 392,516		$ 391,853
3.78% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate	3.78%		3.78%
Long-term debt	$ 250,000		$ 250,000
4.10% Senior Notes [Member]
Debt Instrument [Line Items]
Senior notes, interest rate		4.10%	4.10%
Long-term debt	0		$ 349,434
Current portion of long-term debt	0		349,434
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 366,000		$ 148,000

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