Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020	Sep. 25, 2021	Sep. 26, 2020
Revenue	$ 1,734,299	$ 1,085,546	$ 4,592,551	$ 2,836,626
Investment income	706	714	2,138	2,716
Costs and expenses:
Purchased transportation	1,356,671	838,753	3,583,197	2,183,143
Commissions to agents	135,295	85,848	356,997	236,490
Other operating costs, net of gains on asset sales/dispositions	10,572	7,361	27,117	23,035
Insurance and claims	29,569	21,855	75,198	66,563
Selling, general and administrative	59,198	38,851	158,720	124,779
Depreciation and amortization	12,288	11,240	36,532	34,212
Impairment of intangible and other assets	0	0	0	2,582
Total costs and expenses	1,603,593	1,003,908	4,237,761	2,670,804
Operating income	131,412	82,352	356,928	168,538
Interest and debt expense	965	1,008	2,974	2,936
Income before income taxes	130,447	81,344	353,954	165,602
Income taxes	31,772	19,458	85,745	38,567
Net income	$ 98,675	$ 61,886	$ 268,209	$ 127,035
Diluted earnings per share	$ 2.58	$ 1.61	$ 7.00	$ 3.28
Average diluted shares outstanding	38,218,000	38,386,000	38,342,000	38,673,000
Dividends per common share	$ 0.25	$ 0.21	$ 0.67	$ 0.58