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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
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