Stock-Based And Long-Term Incentive Compensation (Schedule Of ESPP Activity) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received for shares issued	$ 689	$ 2,625	$ 3,074
Compensation expense	$ 19,692	$ 30,987	$ 35,928
Shares issued	532,292	550,950	360,465
2013 Employee Stock Purchase Plan Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 122	$ 463	$ 542

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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