Earnings per share

3 Months Ended

Mar. 31, 2012

Earnings per share [Abstract]

Earnings per share

10.Earnings per share.Basic earnings per share are computed based upon the weighted average number of common shares outstanding. Diluted earnings per share are computed based upon the weighted average number of common shares outstanding and dilutive common share equivalents (consisting of incentive stock options, non-qualified stock options, restricted stock awards and units and employee stock purchase plan shares) outstanding during the periods using the treasury stock method.

The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):

	Three Months ended
	March 31,
	2012		2011
Weighted average number of common shares
outstanding used to compute basic earnings per share		37,269		36,623
Dilutive effect of stock-based awards		885		806
Number of shares used to compute diluted earnings per share		38,154		37,429

The following table presents the weighted average share equivalents outstanding during each period that were excluded from the computation of diluted earnings per share because the exercise price for these options was greater than the average market price of the Company's shares of common stock during the respective periods that became anti-dilutive when applying the treasury stock method (in thousands):

	Three Months ended
	March 31,
	2012		2011
Anti-dilutive common share equivalents outstanding		710		1,261