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Share-Based Compensation (Details) - USD ($)	12 Months Ended
Share-Based Compensation (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2019
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 13,472,000	$ 12,874,000	$ 12,482,000
Stock Options [Member]
Stock option activity [Roll Forward]
Beginning balance (in shares)	1,879,151
Granted (in shares)	65,525
Exercised (in shares)	640,475	491,448	364,984
Forfeited (in shares)	2,150
Ending balance (in shares)	1,302,051	1,879,151
Exercisable (In Shares)	877,812
Stock option weighted average exercise price [Abstract]
Beginning balance (in dollars per share)	$ 48.19
Granted (in dollars per share)	160.67
Exercised (in dollars per share)	26.29
Forfeited (in dollars per share)	150.29
Ending balance (in dollars per share)	64.46	$ 48.19
Exercisable at end of period (in dollars per share)	$ 42.05
Weighted Average Remaining Contractual Term [Abstract]
Weighted average remaining contractual term of shares outstanding (in years)	4 years 1 month 13 days
Weighted average remaining contractual term of shares exercisable at end of period (in years)	2 years 8 months 15 days
Aggregate Intrinsic Value [Abstract]
Ending balance	$ 192,600,967
Exercisable at end of period	$ 149,516,227
Cash Proceeds and Tax Benefits [Abstract]
Exercised (in shares)	640,475	491,448	364,984
Cash proceeds	$ 16,839,000	$ 11,779,000	$ 9,809,000
Intrinsic value of options exercised	97,007,000	61,469,000	33,302,000
Tax benefits realized	$ 24,252,000	$ 15,367,000	$ 12,809,000
Grant Date Fair Value Assumptions [Abstract]
Expected volatility (in hundredths)	21.40%	23.70%	26.60%
Expected term (in years)	7 years	7 years 3 months 18 days	7 years 3 months 18 days
Risk-free interest rate (in hundredths)	2.52%	2.87%	2.44%
Expected dividend yield (in hundredths)	1.30%	1.50%	1.50%
Grant date fair value (in dollars per share)	$ 37.75	$ 35.71	$ 32.00
Share-based compensation	$ 3,021,000	$ 3,218,000	$ 3,553,000
Recognized tax benefits	755,000	805,000	888,000
Unamortized compensation expense	$ 2,700,000
Expense recognition over weighted average period (in years)	2 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	1,037,669
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 10,026,000	$ 9,151,000	$ 8,547,000
Unamortized compensation expense	$ 8,800,000
Expense recognition over weighted average period (in years)	2 years 9 months 18 days
Restricted stock awards [Roll Forward]
Beginning balance (in shares)	307,773
Granted (at market price) (in shares)	71,494
Vested (in shares)	75,143	68,149	79,224
Forfeited (in shares)	820
Ending balance (in shares)	303,304	307,773
Restricted stock awards weighted average grant date fair value [Abstract]
Beginning balance (in dollars per share)	$ 101.93
Granted (at market price) (in dollars per share)	162.81
Vested (in dollars per share)	74.45
Forfeited (in dollars per share)	109.93
Ending balance (in dollars per share)	$ 123.13	$ 101.93
Vested (in shares)	75,143	68,149	79,224
Fair value of restricted stock awards vested	$ 12,316,000	$ 9,642,000	$ 9,260,000
ESPP Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under the ESPP (in shares)	12,716	15,966	16,610
Grant Date Fair Value of most recent ESPP Purchase (per share)				$ 44.45
Grant Date Fair Value Assumptions [Abstract]
Share-based compensation	$ 400,000	$ 500,000	$ 400,000
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	4,319,501
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