Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues
Revenue		$ 302,854	$ 287,497	$ 572,209	$ 566,260
Operating expenses:
Salaries, wages, and related expenses		109,148	106,373	214,100	206,708
Fuel expense		27,989	29,093	56,157	60,045
Operations and maintenance		17,066	15,552	32,816	29,148
Revenue equipment rentals and purchased transportation		76,791	62,755	133,596	129,506
Operating taxes and licenses		3,436	2,283	7,022	5,644
Insurance and claims		17,307	17,148	32,590	32,538
Communications and utilities		1,481	1,272	2,949	2,675
General supplies and expenses		14,657	14,477	28,252	35,307
Depreciation and amortization		23,121	22,130	44,916	43,238
Loss on disposition of property and equipment, net		295	837	621	1,539
Total operating expenses		291,291	271,920	553,019	546,348
Operating income		11,563	15,577	19,190	19,912
Interest expense, net		2,470	3,799	5,327	7,137
Income from equity method investment		(4,268)	(4,094)	(8,044)	(7,770)
Income before income taxes		13,361	15,872	21,907	20,545
Income tax expense		3,521	3,828	5,504	4,677
Income from continuing operations, net of tax		9,840	12,044	16,403	15,868
Income from discontinued operations, net of tax		0	150	0	300
Net income		$ 9,840	$ 12,194	$ 16,403	$ 16,168
Basic income per share: (1)
Income from continuing operations (in dollars per share)		$ 0.38	$ 0.46	$ 0.62	$ 0.6
Income from discontinued operations (in dollars per share)		0	0.01	0	0.01
Net income per share (in dollars per share)	[1]	0.38	0.46	0.62	0.62
Diluted income per share: (1)
Income from continuing operations (in dollars per share)		0.36	0.44	0.6	0.57
Income from discontinued operations (in dollars per share)		0	0.01	0	0.01
Net income per share (in dollars per share)	[1]	$ 0.36	$ 0.44	$ 0.6	$ 0.59
Basic weighted average shares outstanding (in shares)		26,041	26,292	26,295	26,234
Diluted weighted average shares outstanding (in shares)		27,228	27,662	27,564	27,604
Cargo and Freight [Member]
Revenues
Revenue		$ 276,532	$ 256,512	$ 519,751	$ 504,197
Fuel Surcharge [Member]
Revenues
Revenue		$ 26,322	$ 30,985	$ 52,458	$ 62,063

[1] Total may not sum due to rounding.