Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Revenues	$ 299,380	$ 236,574
Operating expenses:
Purchased transportation costs	206,342	167,031
Personnel and related benefits	34,856	26,733
Other operating expenses	35,690	26,072
Depreciation and amortization	3,355	1,960
Acquisition transaction expenses	0	138
Total operating expenses	280,243	221,934
Operating income	19,137	14,640
Interest expense:
Interest on long-term debt	1,875	1,798
Dividends on preferred stock subject to mandatory redemption	0	49
Total interest expense	1,875	1,847
Income before provision for income taxes	17,262	12,793
Provision for income taxes	6,680	4,862
Net income available to common stockholders	$ 10,582	$ 7,931
Earnings per share available to common stockholders:
Basic	$ 0.30	$ 0.26
Diluted	$ 0.29	$ 0.25
Weighted average common stock outstanding:
Basic	34,990	30,742
Diluted	36,743	32,129