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Earnings per Common Share - Anti-dilutive Shares (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2021
shares
Anti-dilutive shares excluded from diluted income per common share  
Net dilutive potential common shares issuable (shares) 31
Employee Stock Option  
Anti-dilutive shares excluded from diluted income per common share  
Net dilutive potential common shares issuable (shares) 31