Net Income Per Share (Schedule of Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator:
Net income	$ 49,387	$ 58,293	$ 25,791
Denominator:
Weighted average common shares - basic	30,241	29,897	30,936
Potentially dilutive common share equivalent	761	743	1,029
Weighted average common shares - dilutive	31,002	30,640	31,965
Basic net income per share	$ 1.63	$ 1.95	$ 0.83
Diluted net income per share	$ 1.59	$ 1.90	$ 0.81
Anti-dilutive employee stock-based awards, excluded	422	832	1,066