Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Revenue	$ 1,373,857	$ 1,975,064	$ 2,809,532	$ 3,945,663
Investment income	2,484	586	3,852	1,307
Costs and expenses:
Purchased transportation	1,053,197	1,545,688	2,154,491	3,096,018
Commissions to agents	122,478	161,856	248,153	311,634
Other operating costs, net of gains on asset sales/dispositions	13,462	10,381	25,840	21,522
Insurance and claims	29,784	34,052	57,431	64,820
Selling, general and administrative	54,529	58,967	108,096	111,680
Depreciation and amortization	14,941	14,288	30,139	28,045
Total costs and expenses	1,288,391	1,825,232	2,624,150	3,633,719
Operating income	87,950	150,418	189,234	313,251
Interest and debt (income) expense	(307)	1,105	(1,033)	2,228
Income before income taxes	88,257	149,313	190,267	311,023
Income taxes	21,698	36,758	45,513	73,629
Net income	$ 66,559	$ 112,555	$ 144,754	$ 237,394
Diluted earnings per share	$ 1.85	$ 3.05	$ 4.03	$ 6.39
Average diluted shares outstanding	35,941,000	36,905,000	35,962,000	37,162,000
Dividends per common share	$ 0.3	$ 0.25	$ 0.6	$ 0.5