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Stock-based Compensation (Changes in Non-vested Restricted Stock Units) (Details) - Restricted Stock Units [Member] - $ / shares
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Shares      
Undistributed as of beginning of period (in shares) 82,300    
Granted (in shares) 28,000.0    
Distributed (in shares) (29,500)    
Forfeited (in shares) (9,900)    
Undistributed as of end of period (in shares) 70,900 82,300  
Weighted- Average Grant Date Fair Value per Share      
Undistributed as of beginning of period (in usd per share) $ 268.39    
Granted (in usd per share) 404.91 $ 0 $ 240.87
Distributed (in usd per share) 304.41    
Forfeited (in usd per share) 286.05    
Undistributed as of end of period (in usd per share) $ 306.01 $ 268.39