Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 24, 2016	Sep. 26, 2015
Revenue	$ 787,938	$ 841,726	$ 2,274,805	$ 2,472,489
Investment income	357	350	1,100	1,043
Costs and expenses:
Purchased transportation	601,002	645,583	1,730,745	1,900,313
Commissions to agents	65,144	69,297	189,075	199,113
Other operating costs, net of gains on asset sales/dispositions	7,492	8,718	21,484	24,388
Insurance and claims	12,488	10,502	42,795	37,610
Selling, general and administrative	34,692	36,811	106,211	111,797
Depreciation and amortization	9,016	7,185	26,109	21,253
Total costs and expenses	729,834	778,096	2,116,419	2,294,474
Operating income	58,461	63,980	159,486	179,058
Interest and debt expense	948	714	2,725	2,208
Income before income taxes	57,513	63,266	156,761	176,850
Income taxes	21,235	23,918	58,985	67,016
Net income	$ 36,278	$ 39,348	$ 97,776	$ 109,834
Earnings per common share	$ 0.86	$ 0.91	$ 2.32	$ 2.50
Diluted earnings per share	$ 0.86	$ 0.90	$ 2.31	$ 2.49
Average number of shares outstanding:
Earnings per common share	42,039,000	43,446,000	42,223,000	43,975,000
Diluted earnings per share	42,170,000	43,607,000	42,341,000	44,134,000
Dividends per common share	$ 0.09	$ 0.08	$ 0.25	$ 0.22