Net Income Per Share (Calculations Of Basic And Diluted Net Income Per Share And Potential Common Shares) (Details) (USD $) In Thousands, except Share data	3 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Net Income Per Share
Net income	$ 2,399	$ 7,145
Net income per share-basic	42,608,457	41,811,888
Basic net income per share	$ 0.06	$ 0.17
Weighted average stock options	546,352	330,295
Weighted average restricted stock units	188,078	339,565
Weighted Average Number of Shares Outstanding, Diluted, Total	43,342,887	42,481,748
Diluted net income per share	$ 0.06	$ 0.17