Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Revenue	$ 7,436,562	$ 6,537,568	$ 4,132,981
Investment income	3,162	2,857	3,399
Costs and expenses:
Purchased transportation	5,804,017	5,114,667	3,192,850
Commissions to agents	614,865	507,209	340,780
Other operating costs, net of gains on asset sales/dispositions	45,192	36,531	30,463
Insurance and claims	125,835	105,463	87,773
Selling, general and administrative	221,279	221,278	167,633
Depreciation and amortization	57,453	49,609	45,855
Impairment of intangible and other assets	0	0	2,582
Commission program termination costs			15,494
Total costs and expenses	6,868,641	6,034,757	3,883,430
Operating income	571,083	505,668	252,950
Interest and debt expense	3,620	3,976	3,953
Income before income taxes	567,463	501,692	248,997
Income taxes	136,549	120,168	56,891
Net income	$ 430,914	$ 381,524	$ 192,106
Diluted earnings per share	$ 11.76	$ 9.98	$ 4.98
Average diluted shares outstanding	36,633,000	38,235,000	38,602,000
Dividends per common share	$ 3.1	$ 2.92	$ 2.79