Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Activity (Details)

v3.24.3
Share-Based Compensation - Activity (Details) - USD ($)
3 Months Ended 9 Months Ended
Feb. 21, 2024
Feb. 21, 2023
Feb. 15, 2022
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2023
Stock Options, Number of Shares                        
Converted/Exercised (in shares)       (10,269) (5,757) (17,409) (4,762) (28,840)        
Stock options, additional disclosures                        
Weighted average remaining contractual term for vested stock options                 4 years 4 months 24 days      
Unrecognized share-based compensation expense                        
Total unrecognized compensation expense related to unvested awards                 $ 22,584,000      
Restricted Stock Awards                        
Restricted Stock Awards, Number of Shares                        
Balance at beginning of period (in shares)         195,500       195,500      
Granted (in shares)                 45,000.0      
Converted/Exercised (in shares)                 (52,900)      
Forfeited/Expired (in shares)                 (6,200)      
Balance at end of period (in shares)                 181,400      
Restricted Stock Awards, Weighted Average Grant Date Fair Value Per Share                        
Balance at beginning of period (in dollars per share)         $ 223.49       $ 223.49      
Granted (in dollars per share)                 419.27      
Converted/Exercised (in dollars per share)                 229.40      
Forfeited/Expired (in dollars per share)                 299.42      
Balance at end of period (in dollars per share)                 $ 269.25      
Unrecognized share-based compensation expense                        
RSAs, Unrecognized Compensation Expense on Unvested Awards                 $ 22,584,000      
Weighted Average Remaining Compensation Expense Period                 1 year      
Assumptions used to estimate the fair values of the awards granted:                        
Measurement period (years)                 2 years 10 months 9 days 2 years 10 months 9 days 2 years 10 months 13 days  
Risk free interest rate (as a percent)                 4.36% 4.42% 1.76%  
Dividend yield (as a percent)                 0.00% 0.00% 0.00%  
Estimated fair value of market-based RSAs at grant date (in dollars per share)                 $ 503.68 $ 270.64 $ 298.20  
Restricted Stock Awards | Performance-based conditions                        
Restricted stock awards, additional disclosures                        
Grant date fair value $ 4,496,000 $ 3,845,000 $ 2,907,000                  
Restricted Stock Awards | Performance-based conditions | Payout Range-0%                        
Restricted stock awards, additional disclosures                        
Payout range (as a percent) 0.00% 0.00% 0.00%                  
Restricted Stock Awards | Performance-based conditions | Payout Range-25%                        
Restricted stock awards, additional disclosures                        
Payout range (as a percent) 25.00% 25.00% 25.00%                  
Related expenses $ 1,124,000 $ 961,000 $ 727,000                  
Restricted Stock Awards | Performance-based conditions | Payout Range-100%                        
Restricted stock awards, additional disclosures                        
Payout range (as a percent) 100.00% 100.00% 100.00%                  
Related expenses $ 4,496,000 $ 3,845,000 $ 2,907,000                  
Restricted Stock Awards | Performance-based conditions | Payout Range-200%                        
Restricted stock awards, additional disclosures                        
Payout range (as a percent) 200.00% 200.00% 200.00%                  
Related expenses $ 8,992,000 $ 7,690,000 $ 5,814,000                  
RSAs granted February 16, 2021 | Performance-based conditions                        
Restricted stock awards, additional disclosures                        
Cumulative period of achievement         3 years              
Cumulative achievement percentage         200.00%              
Total compensation expense recognized over the performance period, net of forfeitures         $ 4,400,000              
Employee Stock Option                        
Stock Options, Number of Shares                        
Balance at beginning of period (in shares)         128,700       128,700      
Converted/Exercised (in shares)                 (16,000.0)      
Balance at end of period (in shares)                 112,700      
Stock Options, Weighted Average Grant Date Fair Value Per Share                        
Balance at beginning of period (in dollars per share)         $ 36.65       $ 36.65      
Converted/Exercised (in dollars per share)                 82.64      
Balance at end of period (in dollars per share)                 30.10      
Stock Options, Weighted Average Exercise Price Per Share                        
Balance at beginning of period (in dollars per share)         $ 98.58       98.58      
Converted/Exercised (in dollars per share)                 201.27      
Balance at end of period (in dollars per share)                 $ 83.97      
Stock options, additional disclosures                        
Aggregate intrinsic value                 $ 36,356,000.0     $ 35,462,800
Converted/Exercised aggregate intrinsic value                 $ 3,312,800      
Exercisable, Number of shares                 112,700      
Exercisable, Weighted Average Grant Date Fair Value Per Share                 $ 30.10      
Exercisable Weighted Average Exercise Price Per Share                 $ 83.97      
Exercisable, Aggregate Intrinsic Value                 $ 36,356,000.0