Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Operating Revenue	$ 196,547	$ 259,861	$ 626,354	$ 804,935
Operating Expenses
Salaries, wages, and benefits	77,253	107,392	257,649	330,205
Rent and purchased transportation	12,303	18,343	39,920	63,893
Fuel	34,081	43,793	105,708	138,125
Operations and maintenance	15,367	19,338	50,085	52,334
Operating taxes and licenses	4,241	5,010	13,404	15,580
Insurance and claims	15,342	11,341	41,419	38,898
Communications and utilities	2,187	2,765	6,658	7,475
Depreciation and amortization	38,742	44,955	121,833	137,596
Other operating expenses	10,971	14,539	35,501	43,596
Gain on disposal of property and equipment	(6,688)	(476)	(11,254)	(1,510)
Total operating expenses	203,799	267,000	660,923	826,192
Operating loss	(7,252)	(7,139)	(34,569)	(21,257)
Interest income	235	258	561	911
Interest expense	(2,908)	(4,243)	(8,974)	(14,119)
Loss before income taxes	(9,925)	(11,124)	(42,982)	(34,465)
Federal and state income tax benefit	(1,641)	(1,841)	(9,971)	(6,596)
Net loss	(8,284)	(9,283)	(33,011)	(27,869)
Other comprehensive income, net of tax	0	0	0	0
Comprehensive loss	$ (8,284)	$ (9,283)	$ (33,011)	$ (27,869)
Net loss per share
Basic	$ (0.11)	$ (0.12)	$ (0.42)	$ (0.35)
Diluted	$ (0.11)	$ (0.12)	$ (0.42)	$ (0.35)
Weighted average shares outstanding
Basic	77,465	78,489	78,024	78,814
Diluted	77,518	78,500	78,086	78,866
Dividends declared per share	$ 0.02	$ 0.02	$ 0.06	$ 0.06