Earnings Per Share (Schedule Of Reconciliation Of Shares Outstanding For Basic And Diluted Earnings Per Share) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Shares outstanding for basic earnings per share	87,537	89,894	87,884	89,881
Dilutive effect of share-based payment awards	1,719	1,244	1,851	1,079
Shares outstanding for diluted earnings per share	89,256	91,138	89,735	90,960