Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Operating Revenue	$ 210,387	$ 274,754	$ 429,807	$ 545,074
Operating Expenses
Salaries, wages, and benefits	87,159	110,116	180,396	222,813
Rent and purchased transportation	13,343	21,688	27,617	45,551
Fuel	33,709	47,011	71,627	94,332
Operations and maintenance	17,439	16,732	34,718	32,996
Operating taxes and licenses	4,422	5,255	9,163	10,570
Insurance and claims	14,154	12,972	26,076	27,556
Communications and utilities	2,206	2,270	4,471	4,710
Depreciation and amortization	41,463	46,138	83,091	92,642
Other operating expenses	11,693	13,431	24,531	29,058
Gain on disposal of property and equipment	(2,782)	(1,123)	(4,566)	(1,034)
Total operating expenses	222,806	274,490	457,124	559,194
Operating (loss) income	(12,419)	264	(27,317)	(14,120)
Interest income	198	288	326	654
Interest expense	(2,962)	(4,574)	(6,066)	(9,875)
Loss before income taxes	(15,183)	(4,022)	(33,057)	(23,341)
Federal and state income tax benefit	(4,328)	(544)	(8,329)	(4,755)
Net loss	(10,855)	(3,478)	(24,728)	(18,586)
Other comprehensive income, net of tax	0	0	0	0
Comprehensive loss	$ (10,855)	$ (3,478)	$ (24,728)	$ (18,586)
Net loss per share
Basic	$ (0.14)	$ (0.04)	$ (0.32)	$ (0.24)
Diluted	$ (0.14)	$ (0.04)	$ (0.32)	$ (0.24)
Weighted average shares outstanding
Basic	78,079	78,913	78,308	78,979
Diluted	78,142	78,981	78,375	79,051
Dividends declared per share	$ 0.02	$ 0.02	$ 0.04	$ 0.04