The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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(Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
(Narrative) (Details) $ in Thousands	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment Units	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of reporting units \| Units			4
Number of operating segments \| Segment			3
Goodwill	$ 264,826		$ 264,826		$ 264,826
Finite-lived intangible assets	46,062		46,062		49,648
Amortization of Intangible Assets	1,800	$ 2,000	$ 3,600	$ 4,100
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
Finite-Lived Intangible Assets [Line Items]
Number of reporting units \| Units			1
Goodwill	92,926		$ 92,926
Finite-lived intangible assets	34,273		$ 34,273		36,538
LTL
Finite-Lived Intangible Assets [Line Items]
Number of reporting units \| Units			1
Goodwill	0		$ 0
Finite-lived intangible assets	$ 659		$ 659		$ 750