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		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Goodwill [Line Items]
Amortization expense	$ 9,201	$ 9,157	$ 27,796	$ 26,875
Estimated amortization expense
Remainder of 2018	9,408		9,408
2019	37,265		37,265
2020	27,001		27,001
2021	13,480		13,480
2022	13,480		13,480
Thereafter	9,107		9,107
Net	109,741		109,741		$ 141,110
NAST
Estimated amortization expense
Remainder of 2018	1,953		1,953
2019	7,820		7,820
2020	260		260
2021	260		260
2022	260		260
Thereafter	461		461
Global Forwarding
Estimated amortization expense
Remainder of 2018	7,455		7,455
2019	29,445		29,445
2020	26,741		26,741
2021	13,220		13,220
2022	13,220		13,220
Thereafter	8,646		8,646
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