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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 |  |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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