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 of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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, 2017	Mar. 31, 2016	Dec. 31, 2016
Goodwill [Line Items]
Amortization expense	$ 8,874	$ 6,093
Estimated amortization expense
Remainder of 2017	26,685
2018	35,036
2019	35,036
2020	24,772
2021	11,251
Thereafter	19,690
Net	152,470		$ 157,050
NAST
Estimated amortization expense
Remainder of 2017	5,670
2018	7,560
2019	7,560
2020	0
2021	0
Thereafter	0
Global Forwarding
Estimated amortization expense
Remainder of 2017	20,640
2018	27,476
2019	27,476
2020	24,772
2021	11,251
Thereafter	19,690
Robinson Fresh
Estimated amortization expense
Remainder of 2017	0
2018	0
2019	0
2020	0
2021	0
Thereafter	0
All Other and Corporate
Estimated amortization expense
Remainder of 2017	375
2018	0
2019	0
2020	0
2021	0
Thereafter	$ 0