Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Revenue	$ 679,340	$ 735,973	$ 1,307,661	$ 1,384,996
Investment income	371	405	745	792
Costs and expenses:
Purchased transportation	516,424	562,781	993,029	1,055,703
Commissions to agents	53,741	56,460	102,829	106,692
Other operating costs, net of gains on asset dispositions	4,201	4,716	9,526	11,188
Insurance and claims	11,848	9,306	23,654	20,401
Selling, general and administrative	35,750	37,662	70,976	76,461
Depreciation and amortization	7,810	6,664	14,993	13,404
Total costs and expenses	629,774	677,589	1,215,007	1,283,849
Operating income	49,937	58,789	93,399	101,939
Interest and debt expense	771	770	1,511	1,494
Income before income taxes	49,166	58,019	91,888	100,445
Income taxes	18,740	22,164	34,682	37,743
Net income	$ 30,426	$ 35,855	$ 57,206	$ 62,702
Earnings per common share	$ 0.66	$ 0.76	$ 1.23	$ 1.34
Diluted earnings per share	$ 0.66	$ 0.76	$ 1.23	$ 1.33
Average number of shares outstanding:
Earnings per common share	46,253,000	46,915,000	46,380,000	46,856,000
Diluted earnings per share	46,386,000	47,104,000	46,555,000	47,083,000
Dividends paid per common share		$ 0.055		$ 0.110