Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 53,344	$ 51,927
Trade accounts receivable, net	1,334,912	1,528,075
Other receivables	354,968	330,764
Inventories	42,186	40,602
Prepaid expenses and other current assets	299,502	260,410
Total current assets	2,084,912	2,211,778
Property and equipment, at cost:
Revenue and service equipment	7,293,093	6,815,776
Land	258,144	88,699
Structures and improvements	462,536	382,007
Software, office equipment and furniture	754,099	712,998
Total property and equipment	8,767,872	7,999,480
Less accumulated depreciation	2,993,959	3,019,663
Net property and equipment	5,773,913	4,979,817
Goodwill	134,057	120,449
Other intangible assets, net	133,896	115,941
Other assets	411,482	358,597
Total assets	8,538,260	7,786,582
Current liabilities:
Current portion of long-term debt	249,961	0
Trade accounts payable	737,364	798,776
Claims accruals	547,277	452,149
Accrued payroll and payroll taxes	94,563	188,252
Other accrued expenses	150,256	129,054
Total current liabilities	1,779,421	1,568,231
Long-term debt	1,326,107	1,261,738
Other long-term liabilities	392,766	369,314
Deferred income taxes	936,208	920,531
Total liabilities	4,434,502	4,119,814
Commitments and Contingencies
Stockholders’ equity:
Preferred stock, $100 par value. 10 million shares authorized; none outstanding	0	0
Common stock, $.01 par value. 1 billion shares authorized; (167,099,432 shares issued at December 31, 2023 and 2022, of which 103,220,027 and 103,743,382 shares were outstanding at December 31, 2023 and 2022, respectively)	1,671	1,671
Additional paid-in capital	549,132	499,897
Retained earnings	6,978,119	6,423,730
Treasury stock, at cost (63,879,405 shares at December 31, 2023, and 63,356,050 shares at December 31, 2022)	(3,425,164)	(3,258,530)
Total stockholders’ equity	4,103,758	3,666,768
Total liabilities and stockholders' equity	$ 8,538,260	$ 7,786,582