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Earnings Per Share Earnings Per Share (Stock Options and Performance Shares Excluded From Common Equivalent Shares) (Details) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   1,000,000
Share-based Payment Arrangement [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 291,000 150,000
Share-based Payment Arrangement, Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,248,000 1,060,000