Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Revenue	$ 868,383	$ 814,443	$ 1,630,763	$ 1,502,640
Investment income	339	332	693	695
Costs and expenses:
Purchased transportation	667,577	628,933	1,254,730	1,158,964
Commissions to agents	70,032	63,861	129,816	116,565
Other operating costs, net of gains on asset sales/dispositions	7,981	6,243	15,670	12,829
Insurance and claims	12,312	13,849	27,108	25,706
Selling, general and administrative	37,738	36,752	74,986	72,352
Depreciation and amortization	7,049	6,565	14,068	13,333
Total costs and expenses	802,689	756,203	1,516,378	1,399,749
Operating income	66,033	58,572	115,078	103,586
Interest and debt expense	713	718	1,494	1,486
Income before income taxes	65,320	57,854	113,584	102,100
Income taxes	24,849	21,929	43,098	38,537
Net income	$ 40,471	$ 35,925	$ 70,486	$ 63,563
Earnings per common share	$ 0.92	$ 0.80	$ 1.59	$ 1.41
Diluted earnings per share	$ 0.92	$ 0.80	$ 1.59	$ 1.40
Average number of shares outstanding:
Earnings per common share	43,892,000	44,935,000	44,240,000	45,171,000
Diluted earnings per share	44,033,000	45,128,000	44,397,000	45,362,000
Dividends per common share	$ 0.07	$ 0.06	$ 0.14	$ 0.12