Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation - Activity (Details)

v3.24.0.1
Share-Based Compensation - Activity (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 21, 2023
Feb. 15, 2022
Feb. 16, 2021
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stock Options, Number of Shares              
Converted/Exercised (in shares)         (53,541) (25,215) (53,275)
Stock options, additional disclosures              
Weighted average remaining contractual term for vested stock options         5 years 3 months 18 days    
Unrecognized share-based compensation expense              
Total unrecognized compensation expense related to unvested awards         $ 19,254,000    
Restricted Stock Awards              
Restricted Stock Awards, Number of Shares              
Balance at beginning of period (in shares)       173,200 173,200    
Granted (in shares)         131,400    
Converted/Exercised (in shares)         (100,700)    
Forfeited/Expired (in shares)         (8,400)    
Balance at end of period (in shares)         195,500 173,200  
Restricted Stock Awards, Weighted Average Grant Date Fair Value Per Share              
Balance at beginning of period (in dollars per share)       $ 195.06 $ 195.06    
Granted (in dollars per share)         201.86    
Converted/Exercised (in dollars per share)         147.25    
Forfeited/Expired (in dollars per share)         229.69    
Balance at end of period (in dollars per share)         $ 223.49 $ 195.06  
Unrecognized share-based compensation expense              
RSAs, Unrecognized Compensation Expense on Unvested Awards         $ 19,190,000    
Weighted Average Remaining Compensation Expense Period         10 months 24 days    
Assumptions used to estimate the fair values of the awards granted:              
Measurement period (years)         2 years 10 months 9 days 2 years 10 months 13 days 2 years 10 months 13 days
Risk free interest rate (as a percent)         4.42% 1.76% 0.22%
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)         $ 270.64 $ 298.20 $ 298.66
Restricted Stock Awards | Performance-based conditions              
Restricted stock awards, additional disclosures              
Grant date fair value $ 4,113,000 $ 3,027,000 $ 2,189,000        
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 $ 1,028,000 $ 757,000 $ 547,000        
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 $ 4,113,000 $ 3,027,000 $ 2,189,000        
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 $ 8,226,000 $ 6,054,000 $ 4,378,000        
RSAs granted February 17, 2020 | 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       $ 5,000,000.0      
Employee Stock Option [Member]              
Stock Options, Number of Shares              
Balance at beginning of period (in shares)       182,200 182,200    
Converted/Exercised (in shares)         (53,500)    
Balance at end of period (in shares)         128,700 182,200  
Stock Options, Weighted Average Grant Date Fair Value Per Share              
Balance at beginning of period (in dollars per share)       $ 32.25 $ 32.25    
Converted/Exercised (in dollars per share)         22.02    
Balance at end of period (in dollars per share)         36.65 $ 32.25  
Stock Options, Weighted Average Exercise Price Per Share              
Balance at beginning of period (in dollars per share)       $ 86.79 86.79    
Converted/Exercised (in dollars per share)         58.46    
Balance at end of period (in dollars per share)         $ 98.58 $ 86.79  
Stock options, additional disclosures              
Aggregate intrinsic value         $ 35,462,800 $ 13,992,300  
Converted/Exercised aggregate intrinsic value         $ 9,407,900    
Exercisable, Number of shares         121,200    
Exercisable, Weighted Average Grant Date Fair Value Per Share         $ 33.41    
Exercisable Weighted Average Exercise Price Per Share         $ 91.47    
Exercisable, Aggregate Intrinsic Value         $ 34,276,800    
Unrecognized share-based compensation expense              
Stock options, Unrecognized Compensation Expense on Unvested Awards         $ 64,000    
Weighted Average Remaining Compensation Expense Period         1 month 6 days