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GOODWILL AND OTHER INTANGIBLE ASSETS - Estimated Amortization Expense on Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Estimated amortization expense |  |
2018 | $ 37,158 |
2019 | 37,117 |
2020 | 26,853 |
2021 | 13,332 |
2022 | 13,332 |
Thereafter | 13,318 |
Net | 141,110 | $ 157,050
NAST |  |
Estimated amortization expense |  |
2018 | 7,820 |
2019 | 7,820 |
2020 | 260 |
2021 | 260 |
2022 | 260 |
Thereafter | 480 |
Global Forwarding |  |
Estimated amortization expense |  |
2018 | 29,297 |
2019 | 29,297 |
2020 | 26,593 |
2021 | 13,072 |
2022 | 13,072 |
Thereafter | 12,838 |
Robinson Fresh |  |
Estimated amortization expense |  |
2018 | 0 |
2019 | 0 |
2020 | 0 |
2021 | 0 |
2022 | 0 |
Thereafter | 0 |
All Other and Corporate |  |
Estimated amortization expense |  |
2018 | 41 |
2019 | 0 |
2020 | 0 |
2021 | 0 |
2022 | 0 |
Thereafter | $ 0 |

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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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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + 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 during the third 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + 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 during the second 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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