Consolidated Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating revenue	$ 279,538	$ 324,448	$ 863,233	$ 941,294
Operating expenses (income):
Salaries, wages and benefits	92,620	99,773	287,468	285,582
Purchased transportation	49,673	64,403	152,075	189,193
Fuel and fuel taxes	48,695	57,299	137,706	163,004
Supplies and maintenance	17,896	14,855	51,291	40,520
Depreciation	29,017	28,381	87,974	81,389
Operating taxes and licenses	2,821	2,748	8,345	8,051
Insurance and claims	13,254	11,949	40,805	38,096
Communications and utilities	2,584	2,135	7,625	6,639
Gain on disposition of revenue equipment	(3,014)	(1,070)	(11,810)	(10,422)
Other	8,762	10,209	27,301	28,681
Total operating expenses	262,308	290,682	788,780	830,733
Operating income	(17,230)	(33,766)	(74,453)	(110,561)
Other	1,017	264	2,938	307
Income before income taxes	18,247	34,030	77,391	110,868
Income taxes expense	4,649	8,384	19,417	26,028
Net income	$ 13,598	$ 25,646	$ 57,974	$ 84,840
Basic earnings per common share (in dollars per share)	$ 0.17	$ 0.32	$ 0.71	$ 1.04
Diluted earnings per common share (in dollars per share)	0.17	0.32	0.71	1.03
Dividends declared per common share (in dollars per share)	$ 0.06	$ 0.06	$ 0.18	$ 0.18