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Earnings Per Share (Schedule Of Number Of Anti-Dilutive Stock Options) (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Weighted average number of shares underlying anti-dilutive shares (in shares) 20 34
Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Weighted average number of shares underlying anti-dilutive shares (in shares) 72 197