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Stock-Based Compensation (Summary Of Outstanding RSUs And PSUs) (Details)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Remaining period to recognize compensation cost 1 year 9 months 3 days
RSUs And PSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested units | shares 1,462
Unrecognized compensation cost | $ $ 13,642