Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Income Statement [Abstract]
Operating Revenue	$ 179,504	$ 196,547	$ 539,887	$ 626,354
Operating Expenses
Salaries, wages, and benefits	65,894	77,253	204,123	257,649
Rent and purchased transportation	9,284	12,303	30,540	39,920
Fuel	43,236	34,081	116,523	105,708
Operations and maintenance	12,261	15,367	36,910	50,085
Operating taxes and licenses	3,759	4,241	11,476	13,404
Insurance and claims	9,329	15,342	33,891	41,419
Communications and utilities	1,956	2,187	5,530	6,658
Depreciation and amortization	30,963	38,742	98,426	121,833
Other operating expenses	8,357	10,971	27,116	35,501
Gain on disposal of property and equipment	(7,832)	(6,688)	(40,199)	(11,254)
Total operating expenses	177,207	203,799	524,336	660,923
Operating income (loss)	2,297	(7,252)	15,551	(34,569)
Interest income	490	235	1,067	561
Interest expense	(1,589)	(2,908)	(5,677)	(8,974)
Income (loss) before income taxes	1,198	(9,925)	10,941	(42,982)
Federal and state income tax (benefit)	239	(1,641)	4,221	(9,971)
Net income (loss)	959	(8,284)	6,720	(33,011)
Other comprehensive income, net of tax	0	0	0	0
Comprehensive income (loss)	$ 959	$ (8,284)	$ 6,720	$ (33,011)
Net income (loss) per share
Basic	$ 0.01	$ (0.11)	$ 0.09	$ (0.42)
Diluted	$ 0.01	$ (0.11)	$ 0.09	$ (0.42)
Weighted average shares outstanding
Basic	77,317	77,465	77,392	78,024
Diluted	77,392	77,518	77,427	78,086
Dividends declared per share	$ 0.02	$ 0.02	$ 0.06	$ 0.06