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Weighted Average Shares (Tables)

12 Months Ended

Dec. 31, 2011

Weighted Average Shares [Abstract]

Calculation of weighted average shares

		Year Ended December 31,
		2011				2010				2009
Basic weighted-average common shares outstanding			41,859				39,924				39,659
Effect of dilutive stock options			903				373				-
Diluted weighted-average common and common-equivalent shares outstanding			42,762				40,297				39,659

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- Definition

Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Topic 260

-SubTopic 10

-Publisher FASB

-Number

-Article

-Subparagraph

-Name Accounting Standards Codification

-Paragraph 1

-Section 50

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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