Stock-Based Compensation (Summary Of Outstanding Restricted Stock And Performance Stock Units) (Details) - Restricted Stock Units And Performance Share Units [Member] shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested units | shares	1,225
Unrecognized compensation cost | $	$ 16,421
Period to recognize compensation cost	1 year 7 months 6 days