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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net earnings $ 518,597 $ 352,028
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation and amortization 415,839 392,786
Noncash lease expense 40,160 34,110
Share-based compensation 47,411 48,658
Loss on sale of revenue equipment and other 2,317 2,255
Deferred income taxes 38,566 12,223
Changes in operating assets and liabilities:    
Trade accounts receivable (318,545) (109,996)
Other assets 131,753 7,910
Trade accounts payable 101,636 86,867
Income taxes payable or receivable (16,976) 45,411
Claims accruals 10,464 (5,440)
Accrued payroll and other accrued expenses (1,373) 44,182
Net cash provided by operating activities 969,849 910,994
Cash flows from investing activities:    
Additions to property and equipment (572,717) (559,763)
Net proceeds from sale of equipment 61,642 111,042
Changes in other assets (79) 49
Net cash used in investing activities (511,154) (448,672)
Cash flows from financing activities:    
Proceeds from revolving lines of credit and other 1,516 221,618
Payments on revolving lines of credit and other 0 (220,100)
Purchase of treasury stock (136,917) (75,193)
Stock repurchased for payroll taxes and other (14,110) (19,390)
Dividends paid (92,891) (85,708)
Net cash used in financing activities (242,402) (178,773)
Net change in cash and cash equivalents 216,293 283,549
Cash and cash equivalents at beginning of period 313,302 35,000
Cash and cash equivalents at end of period 529,595 318,549
Supplemental disclosure of cash flow information:    
Interest 45,643 47,095
Income taxes 140,992 58,497
Noncash investing activities    
Accruals for equipment received $ 72,459 $ 36,010