Share-Based Compensation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 31, 2023
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 19,582,000	$ 14,879,000	$ 15,187,000
Recognized tax benefits	$ (6,700,000)	$ (10,800,000)	$ (30,000,000)
Stock Options [Member]
Stock option activity [Roll Forward]
Beginning balance (in shares)	642,925
Granted (in shares)	33,408
Exercised (in shares)	90,439	71,737	274,253
Forfeited (in shares)	15,172
Ending balance (in shares)	570,722	642,925
Exercisable (In Shares)	371,551
Stock option weighted average exercise price [Abstract]
Beginning balance (in dollars per share)	$ 154.57
Granted (in dollars per share)	357.52
Exercised (in dollars per share)	92.52
Forfeited (in dollars per share)	293.44
Ending balance (in dollars per share)	173.13	$ 154.57
Exercisable at end of period (in dollars per share)	$ 102.10
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining contractual term of shares outstanding (in years)	4 years 2 months 19 days
Weighted average remaining contractual term of shares exercisable at end of period (in years)	2 years 5 months 23 days
Aggregate Intrinsic Value [Abstract]
Ending balance	$ 129,309,839
Exercisable at end of period	$ 110,210,899
Cash Proceeds and Tax Benefits [Abstract]
Exercised (in shares)	90,439	71,737	274,253
Cash proceeds	$ 8,368,000	$ 6,247,000	$ 14,435,000
Intrinsic value of options exercised	23,356,000	21,976,000	118,305,000
Tax benefits realized	$ 5,839,000	$ 5,494,000	$ 29,576,000
Grant Date Fair Value Assumptions [Abstract]
Expected volatility (in hundredths)	31.00%	28.90%	27.00%
Expected term (in years)	7 years 4 months 24 days	7 years 1 month 6 days	6 years 10 months 24 days
Risk-free interest rate (in hundredths)	4.01%	2.92%	1.00%
Expected dividend yield (in hundredths)	1.15%	1.15%	1.15%
Grant date fair value (in dollars per share)	$ 130.74	$ 116.56	$ 83.05
Share-based compensation	$ 4,618,000	$ 3,413,000	$ 2,846,000
Recognized tax benefits	1,154,000	853,000	712,000
Unamortized compensation expense	$ 8,100,000
Expense recognition over weighted average period (in years)	2 years 9 months 18 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award performance period	3 years
Shares available for grant	853,337
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 14,487,000	$ 11,024,000	$ 11,543,000
Unamortized compensation expense	$ 23,000,000
Expense recognition over weighted average period (in years)	2 years 4 months 24 days
Restricted stock awards [Roll Forward]
Beginning balance (in shares)	212,717
Granted (at market price) (in shares)	55,196
Vested (in shares)	58,705	78,931	69,069
Forfeited (in shares)	5,571
Ending balance (in shares)	203,637	212,717
Restricted stock awards weighted average grant date fair value [Abstract]
Beginning balance (in dollars per share)	$ 256.97
Granted (at market price) (in dollars per share)	357.96
Vested (in dollars per share)	172.24
Forfeited (in dollars per share)	326.45
Ending balance (in dollars per share)	$ 306.79	$ 256.97
Vested (in shares)	58,705	78,931	69,069
Fair value of restricted stock awards vested	$ 20,906,000	$ 37,258,000	$ 24,005,000
ESPP Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under the ESPP (in shares)	7,640	7,658	8,649
Grant Date Fair Value of most recent ESPP Purchase (per share)				$ 57.71
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 500,000	$ 500,000	$ 800,000
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	3,947,708
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