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
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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 of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the 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 of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during 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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Goodwill [Line Items]
Amortization expense	$ 8,843	$ 6,095	$ 17,718	$ 12,188
Estimated amortization expense
Remainder of 2017	17,864		17,864
2018	35,036		35,036
2019	35,036		35,036
2020	24,772		24,772
2021	11,251		11,251
Thereafter	19,690		19,690
Net	143,649		143,649		$ 157,050
NAST
Estimated amortization expense
Remainder of 2017	3,780		3,780
2018	7,560		7,560
2019	7,560		7,560
2020	0		0
2021	0		0
Thereafter	0		0
Global Forwarding
Estimated amortization expense
Remainder of 2017	13,804		13,804
2018	27,476		27,476
2019	27,476		27,476
2020	24,772		24,772
2021	11,251		11,251
Thereafter	19,690		19,690
Robinson Fresh
Estimated amortization expense
Remainder of 2017	0		0
2018	0		0
2019	0		0
2020	0		0
2021	0		0
Thereafter	0		0
All Other and Corporate
Estimated amortization expense
Remainder of 2017	280		280
2018	0		0
2019	0		0
2020	0		0
2021	0		0
Thereafter	$ 0		$ 0