Share-Based Awards (Summary Of Stock Option Transactions) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options granted during period (in shares)	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning of period	1,404,000
Options exercised	(160,000)
Options forfeited	(189,000)
Options outstanding, end of period	1,055,000	1,404,000
Exercisable, end of period	1,055,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Price, Options outstanding, beginning of period (in dollars per share)	$ 48
Weighted-Average Price, Options exercised (in dollars per share)	22
Weighted-Average Price, Options forfeited (in dollars per share)	59
Weighted-Average Price, Options outstanding, end of period (in dollars per share)	50	$ 48
Weighted-Average Price, Exercisable, end of period (in dollars per share)	$ 50