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Earnings Per Share (Antidilutive Effect on Weighted Average Shares) (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Employee equity incentive plans    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 4,148 3,419