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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net earnings $ 574,752 $ 768,048
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 543,498 472,914
Noncash lease expense 71,766 61,656
Share-based compensation 60,518 59,737
(Gain)/loss on sale of revenue equipment and other 17,244 (20,970)
Deferred income taxes 65,989 90,463
Changes in operating assets and liabilities:    
Trade accounts receivable 224,387 (212,325)
Other assets 165,622 102,506
Trade accounts payable (7,564) 55,640
Income taxes payable or receivable (2,366) (7,616)
Claims accruals (8,510) 34,322
Accrued payroll and other accrued expenses (175,724) (48,969)
Net cash provided by operating activities 1,529,612 1,355,406
Cash flows from investing activities:    
Additions to property and equipment (1,558,587) (1,087,881)
Net proceeds from sale of equipment 238,682 69,853
Business acquisitions (85,000) (118,101)
Net cash used in investing activities (1,404,905) (1,136,129)
Cash flows from financing activities:    
Payments on long-term debt 0 (350,000)
Proceeds from revolving lines of credit and other 2,093,600 1,035,200
Payments on revolving lines of credit and other (1,911,100) (735,200)
Purchase of treasury stock (135,036) (300,030)
Stock repurchased for payroll taxes and other (18,356) (15,234)
Dividends paid (130,544) (125,228)
Net cash used in financing activities (101,436) (490,492)
Net change in cash and cash equivalents 23,271 (271,215)
Cash and cash equivalents at beginning of period 51,927 355,549
Cash and cash equivalents at end of period 75,198 84,334
Supplemental disclosure of cash flow information:    
Interest 56,189 48,694
Income taxes 115,145 156,304
Noncash investing activities    
Accruals for equipment received $ 75,348 $ 70,903