Share-Based Compensation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jul. 31, 2022
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 14,879,000	$ 15,187,000	$ 14,516,000
Recognized tax benefits	$ (10,800,000)	$ (30,000,000)	$ (28,600,000)
Stock Options [Member]
Stock option activity [Roll Forward]
Beginning balance (in shares)	651,617
Granted (in shares)	75,202
Exercised (in shares)	71,737	274,253	482,361
Forfeited (in shares)	12,157
Ending balance (in shares)	642,925	651,617
Exercisable (In Shares)	391,430
Stock option weighted average exercise price [Abstract]
Beginning balance (in dollars per share)	$ 123.98
Granted (in dollars per share)	371.80
Exercised (in dollars per share)	87.09
Forfeited (in dollars per share)	260.53
Ending balance (in dollars per share)	154.57	$ 123.98
Exercisable at end of period (in dollars per share)	$ 87.02
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining contractual term of shares outstanding (in years)	4 years 7 months 28 days
Weighted average remaining contractual term of shares exercisable at end of period (in years)	2 years 10 months 2 days
Aggregate Intrinsic Value [Abstract]
Ending balance	$ 101,227,921
Exercisable at end of period	$ 84,298,268
Cash Proceeds and Tax Benefits [Abstract]
Exercised (in shares)	71,737	274,253	482,361
Cash proceeds	$ 6,247,000	$ 14,435,000	$ 17,657,000
Intrinsic value of options exercised	21,976,000	118,305,000	116,794,000
Tax benefits realized	$ 5,494,000	$ 29,576,000	$ 29,199,000
Grant Date Fair Value Assumptions [Abstract]
Expected volatility (in hundredths)	28.90%	27.00%	20.70%
Expected term (in years)	7 years 1 month 6 days	6 years 10 months 24 days	6 years 9 months 18 days
Risk-free interest rate (in hundredths)	2.92%	1.00%	1.22%
Expected dividend yield (in hundredths)	1.15%	1.15%	1.30%
Grant date fair value (in dollars per share)	$ 116.56	$ 83.05	$ 42.52
Share-based compensation	$ 3,413,000	$ 2,846,000	$ 2,842,000
Recognized tax benefits	853,000	712,000	710,000
Unamortized compensation expense	$ 8,700,000
Expense recognition over weighted average period (in years)	3 years 3 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	902,962
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 11,024,000	$ 11,543,000	$ 10,965,000
Unamortized compensation expense	$ 21,900,000
Expense recognition over weighted average period (in years)	2 years 9 months 18 days
Restricted stock awards [Roll Forward]
Beginning balance (in shares)	260,738
Granted (at market price) (in shares)	53,926
Vested (in shares)	78,931	69,069	77,294
Forfeited (in shares)	23,016
Ending balance (in shares)	212,717	260,738
Restricted stock awards weighted average grant date fair value [Abstract]
Beginning balance (in dollars per share)	$ 190.26
Granted (at market price) (in dollars per share)	393.64
Vested (in dollars per share)	137.60
Forfeited (in dollars per share)	273.55
Ending balance (in dollars per share)	$ 256.97	$ 190.26
Vested (in shares)	78,931	69,069	77,294
Fair value of restricted stock awards vested	$ 37,258,000	$ 24,005,000	$ 16,813,000
ESPP Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under the ESPP (in shares)	7,658	8,649	10,929
Grant Date Fair Value of most recent ESPP Purchase (per share)				$ 53.65
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 500,000	$ 800,000	$ 700,000
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	4,015,569
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