Earnings Per Share (Schedule Of Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share Reconciliation [Line Items]
Net income	$ 7,917	$ 3,852
Denominator for basic earnings per share – weighted-average number of common shares outstanding during the period	36,250	36,790
Denominator for diluted earnings per share	36,711	37,071
Basic earnings per share	$ 0.22	$ 0.10
Diluted earnings per share	$ 0.22	$ 0.10
Stock Options [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to exercise of dilutive options	51	77
Restricted Stock Units [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to exercise of dilutive options	410	204