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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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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GOODWILL AND OTHER INTANGIBLE ASSETS - Estimated Amortization Expense on Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Goodwill [Line Items]
Amortization expense	$ 9,399	$ 8,874
Estimated amortization expense
Remainder of 2018	27,760
2019	37,117
2020	26,853
2021	13,332
2022	13,332
Thereafter	12,005
Net	130,399		$ 141,110
NAST
Estimated amortization expense
Remainder of 2018	5,866
2019	7,820
2020	260
2021	260
2022	260
Thereafter	391
Global Forwarding
Estimated amortization expense
Remainder of 2018	21,894
2019	29,297
2020	26,593
2021	13,072
2022	13,072
Thereafter	11,614
Robinson Fresh
Estimated amortization expense
Remainder of 2018	0
2019	0
2020	0
2021	0
2022	0
Thereafter	0
All Other and Corporate
Estimated amortization expense
Remainder of 2018	0
2019	0
2020	0
2021	0
2022	0
Thereafter	$ 0