Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016		Jun. 30, 2015
Income Statement [Abstract]
Revenues	[1]	$ 483,417	$ 517,623	$ 949,963		$ 1,006,457
Operating expenses:
Purchased transportation costs	[1]	315,661	345,425	623,700		672,802
Personnel and related benefits	[1]	71,690	66,103	140,039		129,067
Other operating expenses	[1]	85,661	77,010	159,534		148,222
Depreciation and amortization	[1]	9,179	7,434	18,388		14,241
Total operating expenses	[1]	482,191	495,972	941,661		964,332
Operating income	[1]	1,226	21,651	8,302		42,125
Interest expense	[1]	5,695	4,373	11,303		8,982
(Loss) income before provision for income taxes	[1]	(4,469)	17,278	(3,001)		33,143
(Benefit from) provision for income taxes	[1]	(1,730)	6,707	(1,162)		12,752
Net income available to common stockholders	[1]	$ (2,739)	$ 10,571	$ (1,839)	[2]	$ 20,391	[2]
(Loss) earnings per share:
Basic (in dollars per share)	[1]	$ (0.07)	$ 0.28	$ (0.05)		$ 0.54
Diluted (in dollars per share)	[1]	$ (0.07)	$ 0.27	$ (0.05)		$ 0.52
Weighted average common stock outstanding:
Basic (in shares)	[1]	38,319,000	38,170,000	38,302,000		38,091,000
Diluted (in shares)	[1]	38,319,000	39,524,000	38,302,000		39,425,000

[1] See Note 13 “Restatement of Previously Issued Financial Statements

[2] See Note 13 “Restatement of Previously Issued Financial Statements.”