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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 |  |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition 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. + References No definition available. + Details
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