Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 52,604	$ 51,927
Trade accounts receivable, net	1,382,896	1,528,075
Prepaid expenses and other	553,427	631,776
Total current assets	1,988,927	2,211,778
Property and equipment, at cost	8,163,778	7,999,480
Less accumulated depreciation	2,965,980	3,019,663
Net property and equipment	5,197,798	4,979,817
Goodwill and intangible assets, net	231,518	236,390
Other assets	372,159	358,597
Total assets	7,790,402	7,786,582
Current liabilities:
Current portion of long-term debt	249,785	0
Trade accounts payable	749,774	798,776
Claims accruals	485,623	452,149
Accrued payroll	96,961	188,252
Other accrued expenses	121,440	129,054
Total current liabilities	1,703,583	1,568,231
Long-term debt	991,710	1,261,738
Other long-term liabilities	375,761	369,314
Deferred income taxes	921,977	920,531
Stockholders' equity	3,797,371	3,666,768
Total liabilities and stockholders' equity	$ 7,790,402	$ 7,786,582