Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Revenue	$ 2,664,780	$ 2,770,799	$ 2,628,374
Investment income	1,475	1,563	1,705
Costs and expenses:
Purchased transportation	2,046,927	2,130,323	2,007,666
Commissions to agents	211,355	218,122	209,917
Other operating costs, net of gains on asset dispositions	21,568	22,582	28,285
Insurance and claims	50,438	37,289	42,638
Selling, general and administrative	131,710	138,094	136,841
Depreciation and amortization	27,667	25,213	23,905
Total costs and expenses	2,489,665	2,571,623	2,449,252
Operating income	176,590	200,739	180,827
Interest and debt expense	3,211	3,110	3,109
Income from continuing operations before income taxes	173,379	197,629	177,718
Income taxes	64,457	71,063	66,175
Income from continuing operations	108,922	126,566	111,543
Discontinued operations:
Income from discontinued operations, net of income taxes	4,058	3,215	1,464
Gain on sale of discontinued operations, net of income taxes	33,029
Income from discontinued operations, net of income taxes	37,087	3,215	1,464
Net income	$ 146,009	$ 129,781	$ 113,007
Earnings per common share:
Income from continuing operations	$ 2.37	$ 2.71	$ 2.35
Income from discontinued operations	$ 0.81	$ 0.07	$ 0.03
Earnings per common share	$ 3.17	$ 2.78	$ 2.38
Diluted earnings per share:
Income from continuing operations	$ 2.36	$ 2.70	$ 2.35
Income from discontinued operations	$ 0.80	$ 0.07	$ 0.03
Diluted earnings per share	$ 3.16	$ 2.77	$ 2.38
Average number of shares outstanding:
Earnings per common share	46,039,000	46,698,000	47,444,000
Diluted earnings per share	46,210,000	46,877,000	47,524,000
Dividends per common share	$ 0.35	$ 0.73	$ 0.21