Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING REVENUE	$ 1,207,458	$ 967,996	$ 607,284
Operating Expenses
Salaries, wages and benefits	474,803	346,271	250,035
Rent and purchased transportation	112,749	54,288	3,810
Fuel	212,228	194,608	99,597
Operations and maintenance	63,358	39,092	21,522
Operating taxes and licenses	21,804	16,387	13,595
Insurance and claims	45,278	34,436	20,826
Communications and utilities	10,508	6,995	4,447
Depreciation and amortization	199,039	133,047	104,083
Other operating expenses	66,393	51,420	21,400
Gain on disposal of property and equipment	(41,087)	(96,906)	(37,438)
Total operating expenses	1,165,073	779,638	501,877
Operating income	42,385	188,358	105,407
Interest income	1,655	1,288	640
Interest expense	(24,187)	(8,555)	0
Income before income taxes	19,853	181,091	106,047
Federal and state income tax expense	5,078	47,507	26,770
Net Income	14,775	133,584	79,277
Other comprehensive income, net of tax	0	0	0
Comprehensive income	$ 14,775	$ 133,584	$ 79,277
Net income per share
Basic	$ 0.19	$ 1.69	$ 1.00
Diluted	$ 0.19	$ 1.69	$ 1.00
Weighted average shares outstanding
Basic	79,010	78,941	79,573
Diluted	79,079	78,974	79,612
Dividends declared per share	$ 0.08	$ 0.08	$ 0.58