Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Operating Revenue	$ 306,169	$ 187,821	$ 637,085	$ 339,097
Operating Expenses
Salaries, wages, and benefits	120,311	65,869	243,643	124,506
Rent and purchased transportation	28,468	3,127	61,611	3,874
Fuel	49,867	42,046	107,396	71,758
Operations and maintenance	16,047	6,066	31,073	11,146
Operating taxes and licenses	5,457	3,352	11,001	6,562
Insurance and claims	10,433	6,339	21,435	11,905
Communications and utilities	2,679	1,126	5,555	2,204
Depreciation and amortization	48,337	24,309	96,806	47,620
Other operating expenses	16,362	12,244	34,253	18,042
Gain on disposal of property and equipment	(8,022)	(81,712)	(14,809)	(85,970)
Total operating expenses	289,939	82,766	597,964	211,647
Operating income	16,230	105,055	39,121	127,450
Interest income	592	260	1,076	406
Interest Expense	(6,111)	(174)	(12,187)	(174)
Income before income taxes	10,711	105,141	28,010	127,682
Federal and state income taxes	2,940	28,235	7,627	34,001
Net Income	7,771	76,906	20,383	93,681
Other comprehensive income, net of tax	0	0	0	0
Comprehensive income	$ 7,771	$ 76,906	$ 20,383	$ 93,681
Net income per share
Basic	$ 0.10	$ 0.97	$ 0.26	$ 1.19
Diluted	$ 0.10	$ 0.97	$ 0.26	$ 1.19
Weighted average shares outstanding
Basic	78,999	78,934	78,993	78,931
Diluted	79,081	78,959	79,052	78,956
Dividends declared per share	$ 0.02	$ 0.02	$ 0.04	$ 0.04