ACQUISITION (Details) (USD $)			0 Months Ended	3 Months Ended
	Mar. 31, 2012	Jun. 15, 2012 Secured Term Loan	Jun. 15, 2012 Panther Expedited Services, Inc.	Mar. 31, 2012 Panther Expedited Services, Inc.	Mar. 31, 2013 Panther Expedited Services, Inc. Software
ACQUISITION
Business acquisition, acquired percentage			100.00%
Cash purchase price, net of cash acquired			$ 180,000,000
Debt issued for funding the acquisition		100,000,000
Preliminary fair value of acquired assets and liabilities
Accounts receivable			31,824,000
Prepaid expenses			5,205,000
Deferred income taxes			1,796,000
Property and equipment (excluding acquired software)			5,678,000
Software			31,600,000
Intangible assets			79,000,000
Other assets			3,866,000
Total identifiable assets acquired			158,969,000
Accounts payable			13,344,000
Accrued expenses and other current liabilities			7,436,000
Other liabilities			228,000
Deferred income taxes			29,294,000
Total liabilities			50,302,000
Net identifiable assets acquired			108,667,000
Goodwill			71,372,000
Cash paid, net of cash acquired			180,039,000
Accounts receivable, fair value			31,800,000
Accounts receivable, gross contractual amount			32,300,000
Accounts receivable, estimated uncollectible			500,000
Amortization period					7 years
Pro forma consolidated statement of operations
Revenue				492,597,000
Loss before income taxes				(22,600,000)
Net loss				(13,562,000)
Diluted EPS (in dollars per share)				$ (0.53)
Deferred tax valuation allowances excluded from pro forma information	$ 4,700,000			$ 4,700,000
Deferred tax valuation allowances excluded from pro forma information (in dollars per share)				$ 0.18