Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Operating Revenue	$ 219,420	$ 270,320
Operating Expenses
Salaries, wages, and benefits	93,237	112,697
Rent and purchased transportation	14,274	23,863
Fuel	37,918	47,321
Operations and maintenance	17,279	16,264
Operating taxes and licenses	4,741	5,315
Insurance and claims	11,922	14,584
Communications and utilities	2,266	2,440
Depreciation and amortization	41,628	46,504
Other operating expenses	12,837	15,626
(Gain) loss on disposal of property and equipment	(1,784)	89
Total operating expenses	234,318	284,703
Operating loss	(14,898)	(14,383)
Interest income	129	366
Interest expense	(3,105)	(5,302)
Loss before income taxes	(17,874)	(19,319)
Federal and state income tax benefit	(4,001)	(4,211)
Net loss	(13,873)	(15,108)
Other comprehensive income, net of tax	0	0
Comprehensive loss	$ (13,873)	$ (15,108)
Net loss per share
Basic	$ (0.18)	$ (0.19)
Diluted	$ (0.18)	$ (0.19)
Weighted average shares outstanding
Basic	78,540	79,044
Diluted	78,610	79,122
Dividends declared per share	$ 0.02	$ 0.02