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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
CASH FLOWS PROVIDED BY OPERATING ACTIVITIES: |  |  |
Net income | $ 26,922 | $ 70,373 | $ 110,354
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 111,653 | 116,722 | 111,014
Tires in service amortization | 6,888 | 7,172 | 6,604
Deferred income taxes | (15,428) | (14,579) | 11,878
Share-based payment arrangement compensation expense | 2,236 | 2,319 | 2,814
Changes in other current operating items: |  |  |
Receivables | 19,831 | 12,751 | (23,547)
Prepaid expenses and other | (4,055) | (3,939) | (8,227)
Accounts payable | (2,439) | (3,615) | 11,893
Insurance and claims accruals | (2,771) | 1,270 | 3,733
Accrued and other current liabilities | (3,052) | (10,484) | 6,352
Net cash provided by operating activities | 134,814 | 164,378 | 219,489
CASH FLOW USED FOR INVESTING ACTIVITIES: |  |  |
Other | (49) | (45) | (38)
Net cash used for investing activities | (152,138) | (172,540) | (134,958)
CASH FLOWS USED FOR FINANCING ACTIVITIES: |  |  |
Dividends on common stock | (19,540) | (19,509) | (19,563)
Repurchase and retirement of common stock | 0 | 0 | (41,753)
Issuance of common stock from share-based payment arrangement exercises, deferred compensation plan distributions and vesting of performance unit awards | 1,300 | 1,210 | 2,000
Employee taxes paid in exchange for shares withheld | (382) | (926) | (1,610)
Net cash used for financing activities | (18,622) | (19,225) | (60,926)
NET CHANGE IN CASH AND CASH EQUIVALENTS | (35,946) | (27,387) | 23,605
CASH AND CASH EQUIVALENTS: |  |  |
Beginning of year | 53,213 | 80,600 | 56,995
End of year | 17,267 | 53,213 | 80,600
SUPPLEMENTAL NON-CASH DISCLOSURE: |  |  |
Change in property and equipment not yet paid | (7,626) | (1,612) | 10,470
Operating lease assets and liabilities acquired | 253 | 89 | 318
Income taxes | 19,170 | 36,978 | 23,649
Interest | 0 | 10 | 65
Revenue Equipment [Member] |  |  |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Gain on disposition of revenue equipment | (4,971) | (13,612) | (13,379)
CASH FLOW USED FOR INVESTING ACTIVITIES: |  |  |
Revenue equipment additions | (227,838) | (231,943) | (162,556)
Proceeds from revenue equipment dispositions | 81,057 | 68,009 | 41,695
Buildings And Land Office Equipment And Other [Member] |  |  |
CASH FLOW USED FOR INVESTING ACTIVITIES: |  |  |
Revenue equipment additions | (5,392) | (8,614) | (14,067)
Proceeds from revenue equipment dispositions | $ 84 | $ 53 | $ 8

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