Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Consolidated Statements Of Income [Abstract] | ||||
| Service revenues and sales | $ 690,940 | $ 624,900 | $ 2,021,704 | $ 1,890,641 |
| Cost of services provided and goods sold (excluding depreciation) | 457,978 | 425,143 | 1,351,507 | 1,289,778 |
| Selling, general and administrative expenses | 111,469 | 105,775 | 340,993 | 311,685 |
| Depreciation | 14,427 | 13,664 | 42,997 | 40,798 |
| Amortization | 2,974 | 2,570 | 8,263 | 7,713 |
| Other operating expense | 7,670 | 2,998 | 7,740 | 3,075 |
| Total costs and expenses | 594,518 | 550,150 | 1,751,500 | 1,653,049 |
| Income from operations | 96,422 | 74,750 | 270,204 | 237,592 |
| Interest expense | (2,097) | (457) | (4,398) | (1,229) |
| Other income - net | 2,383 | 9,251 | 11,071 | 13,970 |
| Income before income taxes | 96,708 | 83,544 | 276,877 | 250,333 |
| Income taxes | (25,060) | (19,307) | (71,224) | (61,846) |
| Net income | $ 71,648 | $ 64,237 | $ 205,653 | $ 188,487 |
| Earnings Per Share: | ||||
| Net income | $ 5.49 | $ 4.46 | $ 15.46 | $ 12.97 |
| Average number of shares outstanding | 13,058 | 14,394 | 13,300 | 14,535 |
| Diluted Earnings Per Share: | ||||
| Net income | $ 5.45 | $ 4.46 | $ 15.43 | $ 12.89 |
| Average number of shares outstanding | 13,135 | 14,409 | 13,329 | 14,620 |
| Cash Dividends Per Share | $ 0.70 | $ 0.60 | $ 1.90 | $ 1.60 |
| X | ||||||||||
- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Total costs of sales and operating expenses for the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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| X | ||||||||||
- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- References No definition available.
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The net result for the period of deducting operating expenses from operating revenues. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations. No definition available.
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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