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Earnings Per Share Earnings Per Share (Narrative) (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Incremental common shares attributable to dilutive effect of conversion of debt securities 9,000 10,000 337,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 338,440 1,660,919