Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating revenues	$ 616,446	$ 592,703
Operating expenses:
Salaries, wages and benefits	204,853	205,997
Fuel	50,838	48,771
Supplies and maintenance	46,147	45,721
Taxes and licenses	23,233	22,850
Insurance and claims	22,056	36,064
Depreciation	63,951	68,837
Rent and purchased transportation	146,493	126,442
Communications and utilities	3,022	3,808
Other	(6,618)	3,147
Total operating expenses	553,975	561,637
Operating income	62,471	31,066
Other expense (income):
Interest expense	838	1,591
Interest income	(297)	(626)
Other	42	45
Total other expense (income)	583	1,010
Income before income taxes	61,888	30,056
Income taxes	15,396	6,998
Net income	$ 46,492	$ 23,058
Earnings per share:
Basic	$ 0.68	$ 0.33
Diluted	$ 0.68	$ 0.33
Weighted-average common shares outstanding:
Basic	67,932	69,253
Diluted	68,223	69,609