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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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(Intangible Assets Acquired from Business Acquisitions) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 1,800	$ 2,000	$ 3,600	$ 4,100
Intangible assets
Gross Carrying Amount	84,658		84,658		$ 84,658
Accumulated Amortization	(38,596)		(38,596)		(35,010)
Net Carrying Value	46,062		46,062		49,648
TES
Intangible assets
Gross Carrying Amount	55,008		55,008		55,008
Accumulated Amortization	(20,735)		(20,735)		(18,470)
Net Carrying Value	34,273		34,273		36,538
LTL
Intangible assets
Gross Carrying Amount	2,498		2,498		2,498
Accumulated Amortization	(1,839)		(1,839)		(1,748)
Net Carrying Value	659		659		750
Ascent
Intangible assets
Gross Carrying Amount	27,152		27,152		27,152
Accumulated Amortization	(16,022)		(16,022)		(14,792)
Net Carrying Value	11,130		11,130		$ 12,360
Adjustments \| TES And Ascent
Intangible assets
Net Carrying Value	$ 300		$ 300