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Common Stock and Stock-Based Awards Plans (Schedule Of Unrecognized Compensation Cost And Remaining Weighted-Average Amortization Period) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Restricted Stock Units (RSUs) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost $ 26,305
Remaining weighted-average amortization period 2 years 8 months 12 days
Performance-Based Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation cost $ 8,411 [1]
Remaining weighted-average amortization period 2 years 2 months 12 days [1]
[1] Based on the probable achievement of the performance goals identified in each award.