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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
CASH FLOWS PROVIDED BY OPERATING ACTIVITIES: |  |  |
Net income | $ 70,373 | $ 110,354 | $ 85,428
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 116,722 | 111,014 | 102,562
Tires in service amortization | 7,172 | 6,604 | 6,433
Deferred income taxes | (14,579) | 11,878 | 4,065
Share-based payment arrangement compensation expense | 2,319 | 2,814 | 2,518
us-gaap_IncreaseDecreaseInOperatingCapitalAbstract |  |  |
Receivables | 12,751 | (23,547) | (16,745)
Prepaid expenses and other | (3,939) | (8,227) | (5,749)
Accounts payable | (3,615) | 11,893 | (823)
Insurance and claims accruals | 1,270 | 3,733 | 2,419
Accrued and other current liabilities | (10,484) | 6,352 | 7,391
Net cash provided by operating activities | 164,378 | 219,489 | 171,204
CASH FLOW USED FOR INVESTING ACTIVITIES: |  |  |
Other | (45) | (38) | (37)
Net cash used for investing activities | (172,540) | (134,958) | (123,734)
CASH FLOWS USED FOR FINANCING ACTIVITIES: |  |  |
Dividends on common stock | (19,509) | (19,563) | (54,735)
Repurchase and retirement of common stock | 0 | (41,753) | 0
Issuance of common stock from share-based payment arrangement exercises, deferred compensation plan distributions and vesting of performance unit awards | 1,210 | 2,000 | 876
Employee taxes paid in exchange for shares withheld | (926) | (1,610) | (2,743)
Net cash used for financing activities | (19,225) | (60,926) | (56,602)
NET CHANGE IN CASH AND CASH EQUIVALENTS | (27,387) | 23,605 | (9,132)
CASH AND CASH EQUIVALENTS: |  |  |
Beginning of year | 80,600 | 56,995 | 66,127
End of year | 53,213 | 80,600 | 56,995
SUPPLEMENTAL NON-CASH DISCLOSURE: |  |  |
Change in property and equipment not yet paid | (1,612) | 10,470 | (6,187)
Operating lease assets and liabilities acquired | 89 | 318 | 0
Income taxes | 36,978 | 23,649 | 21,719
Interest | 10 | 65 | 0
Revenue Equipment [Member] |  |  |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Gain on disposition of revenue equipment | (13,612) | (13,379) | (16,295)
CASH FLOW USED FOR INVESTING ACTIVITIES: |  |  |
Revenue equipment additions | (231,943) | (162,556) | (193,892)
Proceeds from revenue equipment dispositions | 68,009 | 41,695 | 75,596
Buildings And Land Office Equipment And Other [Member] |  |  |
CASH FLOW USED FOR INVESTING ACTIVITIES: |  |  |
Revenue equipment additions | (8,614) | (14,067) | (5,402)
Proceeds from revenue equipment dispositions | $ 53 | $ 8 | $ 1

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