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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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Goodwill [Line Items]
Amortization expense	$ 9,196	$ 8,843	$ 18,595	$ 17,718
Estimated amortization expense
Remainder of 2018	18,657		18,657
2019	37,305		37,305
2020	27,040		27,040
2021	13,520		13,520
2022	13,520		13,520
Thereafter	9,737		9,737
Net	119,779		119,779		$ 141,110
NAST
Estimated amortization expense
Remainder of 2018	3,913		3,913
2019	7,820		7,820
2020	260		260
2021	260		260
2022	260		260
Thereafter	354		354
Global Forwarding
Estimated amortization expense
Remainder of 2018	14,744		14,744
2019	29,485		29,485
2020	26,780		26,780
2021	13,260		13,260
2022	13,260		13,260
Thereafter	9,383		9,383
Robinson Fresh
Estimated amortization expense
Remainder of 2018	0		0
2019	0		0
2020	0		0
2021	0		0
2022	0		0
Thereafter	0		0
All Other and Corporate
Estimated amortization expense
Remainder of 2018	0		0
2019	0		0
2020	0		0
2021	0		0
2022	0		0
Thereafter	$ 0		$ 0