Share-Based Compensation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jul. 31, 2024
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 19,248,000	$ 19,582,000	$ 14,879,000
Recognized tax benefits	$ 8,800,000	$ 6,700,000	$ 10,800,000
Stock Options [Member]
Stock option activity [Roll Forward]
Beginning balance (in shares)	570,722
Granted (in shares)	28,312
Exercised (in shares)	122,300	90,439	71,737
Forfeited (in shares)	7,955
Ending balance (in shares)	468,779	570,722
Exercisable (In Shares)	297,612
Stock option weighted average exercise price [Abstract]
Beginning balance (in dollars per share)	$ 173.13
Granted (in dollars per share)	391.62
Exercised (in dollars per share)	87.89
Forfeited (in dollars per share)	336.98
Ending balance (in dollars per share)	205.78	$ 173.13
Exercisable at end of period (in dollars per share)	$ 127.83
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining contractual term of shares outstanding (in years)	4 years 2 months 4 days
Weighted average remaining contractual term of shares exercisable at end of period (in years)	2 years 4 months 20 days
Aggregate Intrinsic Value [Abstract]
Ending balance	$ 67,440,657
Exercisable at end of period	$ 63,540,112
Cash Proceeds and Tax Benefits [Abstract]
Exercised (in shares)	122,300	90,439	71,737
Cash proceeds	$ 10,749,000	$ 8,368,000	$ 6,247,000
Intrinsic value of options exercised	36,198,000	23,356,000	21,976,000
Tax benefits realized	$ 9,049,000	$ 5,839,000	$ 5,494,000
Grant Date Fair Value Assumptions [Abstract]
Expected volatility (in hundredths)	32.00%	31.00%	28.90%
Expected term (in years)	8 years 1 month 6 days	7 years 4 months 24 days	7 years 1 month 6 days
Risk-free interest rate (in hundredths)	4.29%	4.01%	2.92%
Expected dividend yield (in hundredths)	1.15%	1.15%	1.15%
Grant date fair value (in dollars per share)	$ 149.37	$ 130.74	$ 116.56
Share-based compensation	$ 4,387,000	$ 4,618,000	$ 3,413,000
Recognized tax benefits	1,097,000	1,154,000	853,000
Unamortized compensation expense	$ 7,400,000
Expense recognition over weighted average period (in years)	2 years 7 months 6 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance period	3 years
Award performance period, extension period	3 years
Shares available for grant	803,009
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 14,436,000	$ 14,487,000	$ 11,024,000
Unamortized compensation expense	$ 22,000,000
Expense recognition over weighted average period (in years)	2 years 2 months 12 days
Restricted stock awards [Roll Forward]
Beginning balance (in shares)	203,637
Granted (at market price) (in shares)	57,434
Vested (in shares)	49,512	58,705	78,931
Forfeited (in shares)	7,106
Ending balance (in shares)	204,453	203,637
Restricted stock awards weighted average grant date fair value [Abstract]
Beginning balance (in dollars per share)	$ 306.79
Granted (at market price) (in dollars per share)	391.72
Vested (in dollars per share)	209.14
Forfeited (in dollars per share)	369.83
Ending balance (in dollars per share)	$ 351.56	$ 306.79
Vested (in shares)	49,512	58,705	78,931
Fair value of restricted stock awards vested	$ 19,241,000	$ 20,906,000	$ 37,258,000
ESPP Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under the ESPP (in shares)	7,707	7,640	7,658
Grant Date Fair Value of most recent ESPP Purchase (per share)				$ 56.11
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 400,000	$ 500,000	$ 500,000
LTIP 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares allocated for issuance (in shares)	9,315,000
Shares available for grant	3,877,023
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares allocated for issuance (in shares)	956,250
Discounted percentage rate offered under the employee stock purchase plan (in hundredths)	85.00%
Minimum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance period, extension period	1 year
Maximum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance period, extension period	2 years