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Stock-based Employee Compensation, Stock Option Plans, and Deferred Compensation Plan for Directors - Summary of Option Activity (Details) - USD ($)
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Number of Shares    
Outstanding at beginning of period (in shares) 1,601,250  
Granted (in shares) 248,000  
Exercised (in shares) (24,375)  
Expired/Forfeited (in shares) (19,000)  
Outstanding at end of period (in shares) 1,805,875  
Exercisable at end of period (in shares) 1,289,750  
Weighted Average Exercise Price per share    
Outstanding at beginning of period (in usd per share) $ 51.73  
Granted (in usd per share) 47.90  
Exercised (in usd per share) 44.17  
Expired/Forfeited (in usd per share) 51.71  
Outstanding at end of period (in usd per share) 51.31  
Exercisable at end of period (in usd per share) $ 52.73  
Aggregate Intrinsic Value    
Outstanding at beginning of period $ 4,886,106  
Granted 0  
Exercised 237,724 $ 3,450
Expired/Forfeited 0  
Outstanding at end of period 833,048  
Exercisable at end of period $ 330,728