Earnings Per Share (Schedule Of Reconciliation Of Shares Outstanding For Basic And Diluted Earnings Per Share) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Shares outstanding for basic earnings per share	88,004	89,824	88,060	89,874
Dilutive effect of share-based payment awards	1,874	993	1,902	984
Shares outstanding for diluted earnings per share	89,878	90,817	89,962	90,858