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(Narrative) (Details)	3 Months Ended
(Narrative) (Details)	Mar. 31, 2019 USD ($) Segment Units	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jul. 01, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of operating segments \| Segment	3
Number of reporting units \| Units	4
Goodwill	$ 264,826,000		$ 264,826,000
Finite-lived intangible assets	40,779,000		42,526,000
Amortization of Intangible Assets	1,700,000	$ 1,800,000
Impairment	$ 0
Customer Relationships \| Minimum
Finite-Lived Intangible Assets [Line Items]
Period of amortization of intangible assets	5 years
Customer Relationships \| Maximum
Finite-Lived Intangible Assets [Line Items]
Period of amortization of intangible assets	12 years
TES [Member]
Finite-Lived Intangible Assets [Line Items]
Number of reporting units \| Units	1
Goodwill	$ 92,926,000
Finite-lived intangible assets	$ 30,957,000		32,049,000
LTL
Finite-Lived Intangible Assets [Line Items]
Number of reporting units \| Units	1
Goodwill	$ 0			$ 0
Finite-lived intangible assets	$ 531,000		573,000
Ascent [Member]
Finite-Lived Intangible Assets [Line Items]
Number of reporting units \| Units	2
Goodwill	$ 171,900,000
Finite-lived intangible assets	$ 9,291,000		$ 9,904,000
TES
Finite-Lived Intangible Assets [Line Items]
Percentage of fair value in excess of carrying values				5.10%
Domestic and International Logistics
Finite-Lived Intangible Assets [Line Items]
Percentage of fair value in excess of carrying values				12.80%
Warehousing & Consolidation
Finite-Lived Intangible Assets [Line Items]
Percentage of fair value in excess of carrying values				112.20%