Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net earnings	$ 768,048	$ 518,597
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	472,914	415,839
Noncash lease expense	61,656	40,160
Share-based compensation	59,737	47,411
(Gain)/loss on sale of revenue equipment and other	(20,970)	2,317
Deferred income taxes	90,463	38,566
Changes in operating assets and liabilities:
Trade accounts receivable	(212,325)	(318,545)
Other assets	102,506	131,753
Trade accounts payable	55,640	101,636
Income taxes payable or receivable	(7,616)	(16,976)
Claims accruals	34,322	10,464
Accrued payroll and other accrued expenses	(48,969)	(1,373)
Net cash provided by operating activities	1,355,406	969,849
Cash flows from investing activities:
Additions to property and equipment	(1,087,881)	(572,717)
Net proceeds from sale of equipment	69,853	61,642
Business acquisitions	(118,101)	0
Changes in other assets	0	(79)
Net cash used in investing activities	(1,136,129)	(511,154)
Cash flows from financing activities:
Payments on long-term debt	(350,000)	0
Proceeds from revolving lines of credit and other	1,035,200	1,516
Payments on revolving lines of credit and other	(735,200)	0
Purchase of treasury stock	(300,030)	(136,917)
Stock repurchased for payroll taxes and other	(15,234)	(14,110)
Dividends paid	(125,228)	(92,891)
Net cash used in financing activities	(490,492)	(242,402)
Net change in cash and cash equivalents	(271,215)	216,293
Cash and cash equivalents at beginning of period	355,549	313,302
Cash and cash equivalents at end of period	84,334	529,595
Supplemental disclosure of cash flow information:
Interest	48,694	45,643
Income taxes	156,304	140,992
Noncash investing activities
Accruals for equipment received	$ 70,903	$ 72,459