Goodwill and Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Intangible assets
Net Carrying Value	$ 14,374
Customer relationships [Member]
Intangible assets
Gross Carrying Amount	19,841	17,099
Accumulated Amortization	(5,467)	(4,389)
Net Carrying Value	14,374	12,710
Customer relationships [Member] | Customer relationships - TL [Member]
Intangible assets
Gross Carrying Amount	16,950	15,115
Accumulated Amortization	(4,351)	(3,430)
Net Carrying Value	12,599	11,685
Customer relationships [Member] | Customer relationships - LTL [Member]
Intangible assets
Gross Carrying Amount	1,358	1,358
Accumulated Amortization	(610)	(497)
Net Carrying Value	748	861
Customer relationships [Member] | Customer Relationships - TMS [Member]
Intangible assets
Gross Carrying Amount	1,533	626
Accumulated Amortization	(506)	(462)
Net Carrying Value	$ 1,027	$ 164