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	12 Months Ended
	Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards/units | shares	846
Unrecognized compensation cost | $	$ 9,472
Period to recognize compensation cost	1 year 9 months 18 days