Condensed Consolidated Statements of Operations (unaudited) - USD ($) shares in Thousands, $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Income Statement [Abstract] | ||||
| Operating Revenue | $ 956,494 | $ 817,115 | $ 1,762,720 | $ 1,604,690 |
| Operating Expenses: | ||||
| Salaries, wages and employees' benefits | 434,385 | 390,975 | 827,681 | 780,231 |
| Purchased transportation | 84,980 | 57,699 | 149,308 | 117,548 |
| Fuel, operating expenses and supplies | 198,743 | 161,634 | 372,232 | 328,305 |
| Operating taxes and licenses | 22,438 | 22,014 | 44,670 | 42,451 |
| Claims and insurance | 24,409 | 22,826 | 47,311 | 44,371 |
| Depreciation and amortization | 64,181 | 62,546 | 126,371 | 121,589 |
| Other operating losses, net | 2,146 | 22 | 3,129 | 628 |
| Total operating expenses | 831,282 | 717,716 | 1,570,702 | 1,435,123 |
| Operating Income | 125,212 | 99,399 | 192,018 | 169,567 |
| Nonoperating (Income) Expenses: | ||||
| Interest expense | 2,048 | 4,742 | 4,622 | 9,027 |
| Interest income | (317) | (34) | (380) | (73) |
| Other, net | (1,994) | (873) | (2,734) | (516) |
| Nonoperating (income) expenses, net | (263) | 3,835 | 1,508 | 8,438 |
| Income Before Income Taxes | 125,475 | 95,564 | 190,510 | 161,129 |
| Income Tax Provision | 31,215 | 24,173 | 46,381 | 39,928 |
| Net Income | $ 94,260 | $ 71,391 | $ 144,129 | $ 121,201 |
| Weighted average common shares outstanding - basic | 26,779 | 26,739 | 26,771 | 26,730 |
| Weighted average common shares outstanding - diluted | 26,833 | 26,785 | 26,822 | 26,782 |
| Basic Earnings Per Share | $ 3.52 | $ 2.67 | $ 5.38 | $ 4.53 |
| Diluted Earnings Per Share | $ 3.51 | $ 2.67 | $ 5.37 | $ 4.53 |
| X | ||||||||||
- Definition FuelOperatingExpensesAndSuppliesss No definition available.
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- Definition PurchasedTransportations No definition available.
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of tax incurred and cost of license directly related to good produced or service rendered. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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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| 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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| X | ||||||||||
- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- 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/2009/role/commonPracticeRef
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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/disclosureRef
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- Definition Amount of interest expense classified as nonoperating. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of interest income from interest-earning asset. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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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/disclosureRef
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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://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense. No definition available.
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- References No definition available.
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- Definition The net result for the period of deducting operating expenses from operating revenues. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Insurance and claims costs directly related to goods produced and sold, or services rendered, during the reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of income (expense) related to nonoperating activities, classified as other. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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| X | ||||||||||
- 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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