Stockholders' Equity And Stock-Based Compensation (Summary Of Stock-Based Compensation Expense By Type) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total stock-based compensation expense	$ 14,601	$ 10,075	$ 11,287
Time-Based Options [Member]
Total stock-based compensation expense	9,235	8,739	10,895
Performance Shares [Member]
Total stock-based compensation expense	4,840	133	100
Restricted Stock Units [Member]
Total stock-based compensation expense		86
ESPP [Member]
Total stock-based compensation expense	$ 526	$ 1,117	$ 292