Consolidated Statements of Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Operating Revenue	$ 259,861	$ 295,026	$ 804,935	$ 932,111
Operating Expenses
Salaries, wages, and benefits	107,392	118,923	330,205	362,566
Rent and purchased transportation	18,343	26,674	63,893	88,285
Fuel	43,793	55,809	138,125	163,205
Operations and maintenance	19,338	16,596	52,334	47,669
Operating taxes and licenses	5,010	5,400	15,580	16,400
Insurance and claims	11,341	9,330	38,898	30,766
Communications and utilities	2,765	2,496	7,475	8,051
Depreciation and amortization	44,955	51,113	137,596	147,919
Other operating expenses	14,539	17,190	43,596	51,443
Gain on disposal of property and equipment	(476)	(1,065)	(1,510)	(15,873)
Total operating expenses	267,000	302,466	826,192	900,431
Operating (loss) income	(7,139)	(7,440)	(21,257)	31,680
Interest income	258	276	911	1,352
Interest Expense	(4,243)	(6,067)	(14,119)	(18,254)
(Loss) income before income taxes	(11,124)	(13,231)	(34,465)	14,778
Federal and state income taxes (benefit)	(1,841)	(2,528)	(6,596)	5,098
Net (loss) income	(9,283)	(10,703)	(27,869)	9,680
Other comprehensive income, net of tax	0	0	0	0
Comprehensive (loss) income	$ (9,283)	$ (10,703)	$ (27,869)	$ 9,680
Net (loss) income per share
Basic	$ (0.12)	$ (0.14)	$ (0.35)	$ 0.12
Diluted	$ (0.12)	$ (0.14)	$ (0.35)	$ 0.12
Weighted average shares outstanding
Basic	78,489	79,021	78,814	79,003
Diluted	78,500	79,103	78,866	79,069
Dividends declared per share	$ 0.02	$ 0.02	$ 0.06	$ 0.06