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GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Expense and Future Amortization (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
Amortization expense $ 9,293 $ 9,399  
Estimated amortization expense      
Remainder of 2019 28,968    
2020 28,379    
2021 14,857    
2022 14,857    
2023 12,260    
Thereafter 6,571    
Finite-lived intangibles, Net 105,892   $ 98,347
NAST      
Estimated amortization expense      
Remainder of 2019 5,853    
2020 245    
2021 245    
2022 245    
2023 245    
Thereafter 223    
Global Forwarding      
Estimated amortization expense      
Remainder of 2019 23,115    
2020 28,134    
2021 14,612    
2022 14,612    
2023 12,015    
Thereafter 6,348    
All Other and Corporate      
Estimated amortization expense      
Remainder of 2019 0    
2020 0    
2021 0    
2022 0    
2023 0    
Thereafter $ 0