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	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intangible and other long-term assets	$ 15,896	$ 15,013
Accounts payable	2,250	2,869
Other long-term liabilities	19,218	20,697
Investment in equity securities	25,735
Total debt		409,050
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	25,735
Total debt		409,050
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Intangible and other long-term assets	15,896	15,013
Accounts payable	2,250	2,869
Other long-term liabilities	$ 19,218	$ 20,697