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Stock-Based Compensation Plans (Schedule of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Shares    
Options outstanding, beginning 13,607  
Granted 0 0
Exercised (3,094)  
Forfeited 0  
Expired 0  
Options outstanding, ending 10,513 13,607
Options exercisable 9,613  
Weighted Average Exercise Price Per Share    
Options outstanding, beginning $ 23.69  
Granted 0  
Exercised 18.24  
Forfeited 0  
Expired 0  
Options outstanding, ending 25.29 $ 23.69
Options exercisable $ 24.22  
Weighted- Average Remaining Contractual Term    
Options outstanding 3 years 1 month 6 days  
Options exercisable 2 years 8 months 12 days  
Aggregate Intrinsic Value    
Options outstanding $ 117  
Options exercisable $ 114