Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Operating Revenue	$ 295,026	$ 273,976	$ 932,111	$ 613,073
Operating Expenses
Salaries, wages, and benefits	118,923	97,429	362,566	221,935
Rent and purchased transportation	26,674	17,046	88,285	20,921
Fuel	55,809	53,412	163,205	125,170
Operations and maintenance	16,596	12,273	47,669	23,419
Operating taxes and licenses	5,400	4,343	16,400	10,905
Insurance and claims	9,330	10,794	30,766	22,699
Communications and utilities	2,496	1,876	8,051	4,080
Depreciation and amortization	51,113	34,789	147,919	82,408
Other operating expenses	17,190	14,108	51,443	32,150
Gain on disposal of property and equipment	(1,065)	(6,836)	(15,873)	(92,806)
Total operating expenses	302,466	239,234	900,431	450,881
Operating income	(7,440)	34,742	31,680	162,192
Interest income	276	537	1,352	943
Interest Expense	(6,067)	(2,345)	(18,254)	(2,520)
(Loss) income before income taxes	(13,231)	32,934	14,778	160,615
Federal and state income taxes	(2,528)	8,519	5,098	42,520
Net Income	(10,703)	24,415	9,680	118,095
Other comprehensive income, net of tax	0	0	0	0
Comprehensive (loss) income	$ (10,703)	$ 24,415	$ 9,680	$ 118,095
Net income per share
Basic	$ (0.14)	$ 0.31	$ 0.12	$ 1.50
Diluted	$ (0.14)	$ 0.31	$ 0.12	$ 1.50
Weighted average shares outstanding
Basic	79,021	78,937	79,003	78,933
Diluted	79,103	78,974	79,069	78,962
Dividends declared per share	$ 0.02	$ 0.02	$ 0.06	$ 0.06