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Equity and Cash Incentive Program - Performance Shares and RSU Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Performance Shares      
Number of Shares      
Unvested, beginning balance (in shares) 85,807    
Granted (in shares) 43,656 40,087 50,371
Forfeited (in shares) (7,360)    
Vested (in shares) (44,342)    
Unvested, ending balance (in shares) 77,761 85,807  
Weighted Average Grant-Date Fair Value      
Unvested, beginning balance (in dollars per share) $ 170.03    
Granted (in dollars per share) 249.48 $ 196.40 $ 148.29
Forfeited (in dollars per share) 197.65    
Vested (in dollars per share) 148.29    
Unvested, ending balance (in dollars per share) $ 224.42 $ 170.03  
Restricted Stock Units (RSUs)      
Number of Shares      
Unvested, beginning balance (in shares) 147,676    
Granted (in shares) 91,439 79,556 87,177
Forfeited (in shares) (12,513)    
Vested (in shares) (73,628)    
Unvested, ending balance (in shares) 152,974 147,676  
Weighted Average Grant-Date Fair Value      
Unvested, beginning balance (in dollars per share) $ 135.98    
Granted (in dollars per share) 153.25 $ 160.21 $ 122.73
Forfeited (in dollars per share) 148.95    
Vested (in dollars per share) 133.83    
Unvested, ending balance (in dollars per share) $ 145.45 $ 135.98