Fair Value Measurements (Summary Of Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - Non Qualified Deferred Compensation Assets and Liabilities [Member] - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intangible and other long-term assets	$ 15,446	$ 15,896
Accounts payable	1,342	2,250
Other long-term liabilities	17,135	19,218
Investment in equity securities	26,605
Total debt		25,735
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intangible and other long-term assets	0
Investment in equity securities	26,605
Total debt		25,735
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intangible and other long-term assets	15,446	15,896
Accounts payable	1,342	2,250
Other long-term liabilities	$ 17,135	$ 19,218