(Intangible Assets Acquired from Business Acquisitions) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 2,100	$ 2,000
Intangible assets
Gross Carrying Amount	97,253		$ 97,253
Accumulated Amortization	(23,706)		(21,559)
Net Carrying Value	73,547		75,694
TL
Intangible assets
Gross Carrying Amount	57,468		57,468
Accumulated Amortization	(10,922)		(9,714)
Net Carrying Value	46,546		47,754
LTL
Intangible assets
Gross Carrying Amount	1,358		1,358
Accumulated Amortization	(1,033)		(1,017)
Net Carrying Value	325		341
Global Solutions
Intangible assets
Gross Carrying Amount	38,427		38,427
Accumulated Amortization	(11,751)		(10,828)
Net Carrying Value	$ 26,676		$ 27,599