(Intangible Assets Acquired from Business Acquisitions) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Intangible assets
Gross Carrying Amount	$ 93,053	$ 93,053
Accumulated Amortization	(17,267)	(13,175)
Net Carrying Value	75,786	79,878
TL [Member]
Intangible assets
Gross Carrying Amount	60,173	60,173
Accumulated Amortization	(11,037)	(8,356)
Net Carrying Value	49,136	51,817
LTL [Member]
Intangible assets
Gross Carrying Amount	1,358	1,358
Accumulated Amortization	(983)	(950)
Net Carrying Value	375	408
TMS [Member]
Intangible assets
Gross Carrying Amount	31,522	31,522
Accumulated Amortization	(5,247)	(3,869)
Net Carrying Value	$ 26,275	$ 27,653