Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

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

	For the Years Ended December 31,
	2017	2016	2015
Shares outstanding for basic earnings per share:	87,769	89,732	92,601
Shares outstanding for diluted earnings per share:
Shares outstanding for basic earnings per share	87,769	89,732	92,601
Dilutive effect of share-based payment awards	1,798	1,152	1,048
	89,567	90,884	93,649

Schedule Of Number Of Anti-Dilutive Stock Options

	For the Years Ended December 31,
	2017	2016	2015
Weighted average number of shares underlying anti-dilutive options	327	88	644