Consolidated Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating revenue	$ 199,023	$ 186,960
Operating expenses (income):
Salaries, wages and benefits	63,524	58,822
Purchased transportation	38,249	35,026
Fuel and fuel taxes	27,677	29,044
Supplies and maintenance	11,121	10,436
Depreciation	22,543	21,815
Operating taxes and licenses	2,333	2,287
Insurance and claims	9,875	10,290
Communications and utilities	1,950	1,683
Gain on disposition of assets	(1,548)	(1,211)
Other	5,566	5,174
Total operating expenses	181,290	173,366
Operating income	17,733	13,594
Other	(278)	(189)
Income before income taxes	18,011	13,783
Income taxes expense	4,465	3,452
Net income	$ 13,546	$ 10,331
Basic earnings per common share (in dollars per share)	$ 0.25	$ 0.19
Diluted earnings per common share (in dollars per share)	0.25	0.19
Dividends declared per common share (in dollars per share)	$ 0.03	$ 0.025