Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Revenue	$ 680,521	$ 717,168	$ 1,988,182	$ 2,102,164
Investment income	366	393	1,111	1,185
Costs and expenses:
Purchased transportation	517,955	548,162	1,510,984	1,603,865
Commissions to agents	53,651	56,036	156,480	162,728
Other operating costs, net of gains on asset dispositions	6,031	6,447	15,557	17,635
Insurance and claims	13,386	8,010	37,040	28,411
Selling, general and administrative	34,244	37,455	105,220	113,916
Depreciation and amortization	7,840	7,072	22,833	20,476
Total costs and expenses	633,107	663,182	1,848,114	1,947,031
Operating income	47,780	54,379	141,179	156,318
Interest and debt expense	856	818	2,367	2,312
Income before income taxes	46,924	53,561	138,812	154,006
Income taxes	17,678	20,460	52,360	58,203
Net income	$ 29,246	$ 33,101	$ 86,452	$ 95,803
Earnings per common share	$ 0.64	$ 0.71	$ 1.87	$ 2.05
Diluted earnings per share	$ 0.64	$ 0.71	$ 1.87	$ 2.04
Average number of shares outstanding:
Earnings per common share	45,708,000	46,614,000	46,156,000	46,775,000
Diluted earnings per share	45,856,000	46,732,000	46,323,000	46,964,000
Dividends paid per common share		$ 0.06		$ 0.17