Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating revenues	$ 592,703	$ 596,117
Operating expenses:
Salaries, wages and benefits	205,997	202,799
Fuel	48,771	56,138
Supplies and maintenance	45,721	45,685
Taxes and licenses	22,850	22,901
Insurance and claims	36,064	22,709
Depreciation	68,837	60,759
Rent and purchased transportation	126,442	132,836
Communications and utilities	3,808	4,011
Other	3,147	260
Total operating expenses	561,637	548,098
Operating income	31,066	48,019
Other expense (income):
Interest expense	1,591	858
Interest income	(626)	(903)
Other	45	(116)
Total other expense (income)	1,010	(161)
Income before income taxes	30,056	48,180
Income taxes	6,998	12,094
Net income	$ 23,058	$ 36,086
Earnings per share:
Basic	$ 0.33	$ 0.51
Diluted	$ 0.33	$ 0.51
Weighted-average common shares outstanding:
Basic	69,253	70,274
Diluted	69,609	70,572