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Stock compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement, Noncash Expense [Abstract] |
Summary of Share-based Compensation Activity | The following table summarizes the share-based compensation activity:
| 2022 |  | 2021 |  | 2020
Share-based compensation expense | $ | 27,224 |  |  | $ | 22,937 |  |  | $ | 20,739 |
Total income tax benefit recognized for share-based compensation arrangements | 6,824 |  |  | 10,912 |  |  | 21,958 |
Net excess tax benefit | 1,292 |  |  | 6,355 |  |  | 17,549 |
Weighted-Average Assumptions used to Estimate Fair Value of Options Granted | The fair value of options granted in 2022, 2021 and 2020 was estimated at the date of grant using a Black-Scholes option pricing model. The following weighted-average assumptions were used:
| 2022 |  | 2021 |  | 2020
Risk-free interest rate | 1.56 | % |  | 0.67 | % |  | 1.16 | %
Expected life of option | 5.03 years |  | 5.01 years |  | 5.00 years
Expected dividend yield | 0.41 | % |  | 0.34 | % |  | 0.39 | %
Expected volatility | 30.09 | % |  | 30.03 | % |  | 23.98 | %
Summary of Stock Option Activity | The following table summarizes the option activity during 2022:
| Shares Subject to Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life In Years |  | Aggregate Intrinsic Value
Outstanding, beginning of the year | 1,107,999 |  |  | $ | 214.13 |  |  |  |  |
Granted | 156,918 |  |  | 330.03 |  |  |  |  |
Exercised | (27,518) |  |  | 95.07 |  |  |  |  |
Forfeited or expired | (8,551) |  |  | 359.54 |  |  |  |  |
Outstanding, end of the year | 1,228,848 |  |  | 230.58 |  |  | 4.77 |  | $ | 66,774 |
Exercisable, end of the year | 990,842 |  |  | $ | 201.19 |  |  | 3.84 |  | $ | 66,746 |
Weighted-Average Assumptions used to Estimate Fair Value of Non-Vested Shares Granted | The following weighted-average assumptions were used:
| 2022 |  | 2021 |  | 2020
Risk-free interest rate | 1.57 | % |  | 0.28 | % |  | 1.07 | %
Expected dividend yield | 0.42 | % |  | 0.34 | % |  | 0.38 | %
Summary of Non-Vested Restricted Stock Unit Activity | The following table summarizes the non-vested restricted stock unit activity during 2022:
| Number of Non-Vested Shares |  | Weighted Average Grant-Date Fair Value |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value
Outstanding, beginning of the year | 135,378 |  |  | $ | 343.89 |  |  |  |  |
Granted | 85,780 |  |  | 323.35 |  |  |  |  |
Vested | (51,831) |  |  | 290.75 |  |  |  |  |
Forfeited | (21,359) |  |  | 352.06 |  |  |  |  |
Outstanding, end of the year | 147,968 |  |  | $ | 349.42 |  |  | 1.5 |  | $ | 36,970 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of non-vested shares, including but not limited to; expected dividends and risk-free rates(s) + References No definition available. + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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