Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues
Revenue	$ 213,553	$ 219,181
Operating expenses:
Salaries, wages, and related expenses	82,825	79,503
Fuel expense	25,265	27,832
Operations and maintenance	12,825	15,174
Revenue equipment rentals and purchased transportation	46,062	48,670
Operating taxes and licenses	3,454	3,183
Insurance and claims	15,614	11,235
Communications and utilities	1,569	1,718
General supplies and expenses	8,568	6,731
Depreciation and amortization, including gains and losses on disposition of property and equipment	16,663	19,709
Total operating expenses	212,845	213,755
Operating income	708	5,426
Interest expense, net	2,892	2,446
Equity in loss (income) of affiliate	735	(3,035)
(Loss) income before income taxes	(2,919)	6,015
Income tax (benefit) expense	(706)	1,582
Net (loss) income	$ (2,213)	$ 4,433
Income per share:
Basic and diluted (loss) income per share (in dollars per share)	$ (0.12)	$ 0.24
Basic weighted average shares outstanding (in shares)	18,088	18,381
Diluted weighted average shares outstanding (in shares)	18,088	18,533
Cargo and Freight [Member]
Revenues
Revenue	$ 192,321	$ 195,761
Fuel Surcharge [Member]
Revenues
Revenue	$ 21,232	$ 23,420