Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 144,529	$ 355,549
Trade accounts receivable, net	1,745,647	1,506,619
Prepaid expenses and other	379,621	451,201
Total current assets	2,269,797	2,313,369
Property and equipment, at cost	6,950,327	6,680,316
Less accumulated depreciation	2,716,061	2,612,661
Net property and equipment	4,234,266	4,067,655
Goodwill and intangible assets, net	241,633	191,093
Other assets	286,245	222,231
Total assets	7,031,941	6,794,348
Current liabilities:
Current portion of long-term debt	351,214	355,972
Trade accounts payable	854,879	772,736
Claims accruals	309,949	307,210
Accrued payroll	143,181	190,950
Other accrued expenses	125,507	102,732
Total current liabilities	1,784,730	1,729,600
Long-term debt	945,628	945,257
Other long-term liabilities	294,314	256,233
Deferred income taxes	753,727	745,442
Stockholders' equity	3,253,542	3,117,816
Total liabilities and stockholders' equity	$ 7,031,941	$ 6,794,348