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Summary Of Significant Accounting Policies (Schedule Of Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share Reconciliation [Line Items]
Net income	$ 7,695	$ 5,915	$ (3,407)	$ 3,852	$ (6,931)	$ 7,136	$ 9,447	$ 13,773	$ 27,716	$ 7,799	$ 10,943	$ (23,641)	$ 14,055	$ 23,425	$ 22,817
Denominator for basic earnings per share – weighted-average number of common shares outstanding during the period													36,524	38,338	46,332
Denominator for diluted earnings per share													36,817	38,763	46,655
Basic	$ 0.21	$ 0.16	$ (0.09)	$ 0.10	$ (0.19)	$ 0.19	$ 0.25	$ 0.34	$ 0.64	$ 0.17	$ 0.23	$ (0.49)	$ 0.38	$ 0.61	$ 0.49
Diluted	$ 0.21	$ 0.16	$ (0.09)	$ 0.10	$ (0.19)	$ 0.19	$ 0.24	$ 0.34	$ 0.64	$ 0.17	$ 0.23	$ (0.49)	$ 0.38	$ 0.60	$ 0.49
Stock Options [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to exercise of dilutive options													36	90	104
Restricted Stock Units [Member]
Earnings Per Share Reconciliation [Line Items]
Incremental common shares attributable to exercise of dilutive options													257	335	219

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