CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Revenue	$ 628,321	$ 649,023
Investment income	374	387
Costs and expenses:
Purchased transportation	476,605	492,922
Commissions to agents	49,088	50,232
Other operating costs, net of gains on asset dispositions	5,325	6,472
Insurance and claims	11,806	11,095
Selling, general and administrative	35,226	38,799
Depreciation and amortization	7,183	6,740
Total costs and expenses	585,233	606,260
Operating income	43,462	43,150
Interest and debt expense	740	724
Income before income taxes	42,722	42,426
Income taxes	15,942	15,579
Net income	$ 26,780	$ 26,847
Earnings per common share	$ 0.58	$ 0.57
Diluted earnings per share	$ 0.57	$ 0.57
Average number of shares outstanding:
Earnings per common share	46,507,000	46,800,000
Diluted earnings per share	46,722,000	47,061,000
Dividends paid per common share		$ 0.055