Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Revenue	$ 1,975,064	$ 1,570,718	$ 3,945,663	$ 2,858,252
Investment income	586	748	1,307	1,432
Costs and expenses:
Purchased transportation	1,545,688	1,228,241	3,096,018	2,226,526
Commissions to agents	161,856	121,693	311,634	221,702
Other operating costs, net of gains on asset sales/dispositions	10,381	8,903	21,522	16,545
Insurance and claims	34,052	24,124	64,820	45,629
Selling, general and administrative	58,967	54,114	111,680	99,522
Depreciation and amortization	14,288	12,143	28,045	24,244
Total costs and expenses	1,825,232	1,449,218	3,633,719	2,634,168
Operating income	150,418	122,248	313,251	225,516
Interest and debt expense	1,105	967	2,228	2,009
Income before income taxes	149,313	121,281	311,023	223,507
Income taxes	36,758	28,987	73,629	53,973
Net income	$ 112,555	$ 92,294	$ 237,394	$ 169,534
Diluted earnings per share	$ 3.05	$ 2.4	$ 6.39	$ 4.41
Average diluted shares outstanding	36,905,000	38,402,000	37,162,000	38,403,000
Dividends per common share	$ 0.25	$ 0.21	$ 0.5	$ 0.42