Goodwill and Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Intangible assets
Net Carrying Value	$ 13,059
Customer relationships [Member]
Intangible assets
Gross Carrying Amount	17,978	17,099
Accumulated Amortization	(4,919)	(4,389)
Net Carrying Value	13,059	12,710
Customer relationships [Member] | Customer relationships - TL [Member]
Intangible assets
Gross Carrying Amount	15,994	15,115
Accumulated Amortization	(3,876)	(3,430)
Net Carrying Value	12,118	11,685
Customer relationships [Member] | Customer relationships - LTL [Member]
Intangible assets
Gross Carrying Amount	1,358	1,358
Accumulated Amortization	(553)	(497)
Net Carrying Value	805	861
Customer relationships [Member] | Customer Relationships - TMS [Member]
Intangible assets
Gross Carrying Amount	626	626
Accumulated Amortization	(490)	(462)
Net Carrying Value	$ 136	$ 164