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Stock-Based Incentive Plans (Schedule of Performance-Based Restricted Stock and Restricted Stock Units Rollforward) (Details) - Operating performance-based restricted stock units - $ / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Shares      
Non-vested shares, beginning of year (in shares) 380,799    
Granted (in shares) 123,956    
Vested, shares (in shares) (107,455)    
Forfeited, shares (in shares) (51,356)    
Non-vested shares, end of year (in shares) 345,944 380,799  
Wtd. Avg. Grant Date Fair Value      
Balance beginning of year (in dollars per share) $ 56.55    
Granted (in dollars per share) 89.29 $ 41.70 $ 98.50
Vested (in dollars per share) 67.09    
Forfeited (in dollars per share) 28.42    
Balance end of year (in dollars per share) $ 68.36 $ 56.55