CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue	$ 768,980	$ 739,885
Transportation costs	681,642	656,143
Gross margin	87,338	83,742
Costs and expenses:
Salaries and benefits	34,583	33,299
Agent fees and commissions	13,274	13,695
General and administrative	13,191	12,577
Depreciation and amortization	1,553	1,660
Total costs and expenses	62,601	61,231
Operating income	24,737	22,511
Other income (expense):
Interest expense	(290)	(307)
Interest and dividend income	29	34
Other, net	(11)	(23)
Total other (expense) income	(272)	(296)
Income before provision for income taxes	24,465	22,215
Provision for income taxes	9,101	8,553
Net income	15,364	13,662
Other comprehensive income:
Foreign currency translation adjustments	26	1
Total comprehensive income	$ 15,390	$ 13,663
Basic earnings per common share	$ 0.42	$ 0.37
Diluted earnings per common share	$ 0.42	$ 0.37
Basic weighted average number of shares outstanding	36,855	37,043
Diluted weighted average number of shares outstanding	36,949	37,143