Earnings per Share

12 Months Ended

Dec. 31, 2011

Earnings per Share [Abstract]

Earnings per Share

9. Earnings per Share.

Basic earnings per share are computed based upon the weighted average number of shares outstanding and diluted earnings per share are computed based upon the weighted average number of shares and dilutive share equivalents (consisting of incentive stock options, non-qualified stock options, restricted stock units, restricted stock awards and employee stock purchase plan contributions) 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):

	Year Ended December 31,
	2011		2010		2009
Weighted average number of common shares		36,876		36,429		36,011
Dilutive effect of stock-based awards		882		-		324
Number of shares used to compute diluted earnings per share		37,758		36,429		36,335

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. Also excluded from the computation of diluted earnings per share were other share equivalents that became anti-dilutive when applying the treasury stock method.

	Year Ended December 31,
	2011		2010		2009
Anti-dilutive common share equivalents outstanding		1,039		1,339		2,660