Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Revenue	$ 1,289,345	$ 1,816,132	$ 4,098,877	$ 5,761,795
Investment income	3,022	716	6,874	2,023
Costs and expenses:
Purchased transportation	986,743	1,416,323	3,141,234	4,512,341
Commissions to agents	115,244	154,125	363,397	465,759
Other operating costs, net of gains on asset sales/dispositions	15,158	13,356	40,998	34,878
Insurance and claims	29,540	31,445	86,971	96,265
Selling, general and administrative	50,975	53,519	159,071	165,199
Depreciation and amortization	14,359	14,582	44,498	42,627
Total costs and expenses	1,212,019	1,683,350	3,836,169	5,317,069
Operating income	80,348	133,498	269,582	446,749
Interest and debt (income) expense	(1,046)	1,047	(2,079)	3,275
Income before income taxes	81,394	132,451	271,661	443,474
Income taxes	19,741	32,233	65,254	105,862
Net income	$ 61,653	$ 100,218	$ 206,407	$ 337,612
Basic earnings per share	$ 1.71	$ 2.76	$ 5.74	$ 9.15
Diluted earnings per share	$ 1.71	$ 2.76	$ 5.74	$ 9.15
Average basic shares outstanding	35,951,000	36,334,000	35,958,000	36,886,000
Average diluted shares outstanding	35,951,000	36,334,000	35,958,000	36,886,000
Dividends per common share	$ 0.33	$ 0.3	$ 0.93	$ 0.8