Earnings Per Share (Schedule Of Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share Reconciliation [Line Items]
Net income	$ 10,960	$ 7,917
Denominator for basic earnings per share – weighted-average number of common shares outstanding during the period	35,245,000	36,250,000
Denominator for diluted earnings per share	35,470,000	36,711,000
Basic earnings per share	$ 0.31	$ 0.22
Diluted earnings per share	$ 0.31	$ 0.22
Stock Options [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to exercise of dilutive options	24,000	51,000
Restricted Stock Units [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to exercise of dilutive options	201,000	410,000