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
(Narrative) (Details) $ in Thousands	Mar. 31, 2017 USD ($) Segment Units	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of operating segments \| Segment	3
Number of reporting units \| Units	4
Goodwill	$ 312,541		$ 312,541
Finite-lived intangible assets	63,471		65,549
Amortization of Intangible Assets	$ 2,100	$ 2,100
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
TL
Finite-Lived Intangible Assets [Line Items]
Goodwill			99,214
Finite-lived intangible assets	$ 40,232		41,367
LTL
Finite-Lived Intangible Assets [Line Items]
Goodwill			0
Finite-lived intangible assets	258		275
Ascent
Finite-Lived Intangible Assets [Line Items]
Goodwill			213,327
Finite-lived intangible assets	$ 22,981		$ 23,907