Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Revenue	$ 775,223	$ 868,383	$ 1,486,867	$ 1,630,763
Investment income	363	339	743	693
Costs and expenses:
Purchased transportation	589,415	667,577	1,129,743	1,254,730
Commissions to agents	64,839	70,032	123,931	129,816
Other operating costs, net of gains on asset sales/dispositions	6,585	7,981	13,992	15,670
Insurance and claims	16,094	12,312	30,307	27,108
Selling, general and administrative	36,905	37,738	71,519	74,986
Depreciation and amortization	8,655	7,049	17,093	14,068
Total costs and expenses	722,493	802,689	1,386,585	1,516,378
Operating income	53,093	66,033	101,025	115,078
Interest and debt expense	888	713	1,777	1,494
Income before income taxes	52,205	65,320	99,248	113,584
Income taxes	19,891	24,849	37,750	43,098
Net income	$ 32,314	$ 40,471	$ 61,498	$ 70,486
Earnings per common share	$ 0.77	$ 0.92	$ 1.45	$ 1.59
Diluted earnings per share	$ 0.76	$ 0.92	$ 1.45	$ 1.59
Average number of shares outstanding:
Earnings per common share	42,235,000	43,892,000	42,315,000	44,240,000
Diluted earnings per share	42,357,000	44,033,000	42,424,000	44,397,000
Dividends per common share	$ 0.08	$ 0.07	$ 0.16	$ 0.14