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Stock-Based Compensation (Summary Of Outstanding RSUs, PSUs And RSAs) (Details)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Period to recognize compensation cost 1 year 7 months 6 days
Restricted Stock Units And Performance Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested units | shares 1,219
Unrecognized compensation cost | $ $ 12,568