Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Schedule Of Reconciliation Of Shares Outstanding For Basic And Diluted Earnings Per Share

	For the Three Months Ended September 30,			For the Nine Months Ended September 30,
		2011	2010		2011	2010
Shares outstanding for basic earnings per share		56,699	57,620		57,141	57,799
Shares outstanding for diluted earnings per share:
Shares outstanding for basic earnings per share		56,699	57,620		57,141	57,799
Dilutive effect of share-based payment awards		1,308	1,656		1,495	1,892
		58,007	59,276		58,636	59,691

Schedule Of Weighted Average Number Of Anti-Dilutive Stock Options

	For the Three Months Ended September 30,			For the Nine Months Ended September 30,
		2011	2010		2011	2010
Weighted average number of shares underlying anti-dilutive options		665	598		566	654