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ACQUISITIONS - Summary of Identifiable Intangible Assets and Estimated Useful Lives (Details) - Customer relationships - USD ($)
$ in Thousands
May 22, 2019
Feb. 28, 2019
Aug. 31, 2017
Dema Service      
Business Acquisition [Line Items]      
Estimated Life (years) 7 years    
Identifiable intangible assets $ 4,252    
Space Cargo      
Business Acquisition [Line Items]      
Estimated Life (years)   7 years  
Identifiable intangible assets   $ 16,439  
Milgram      
Business Acquisition [Line Items]      
Estimated Life (years)     7 years
Identifiable intangible assets     $ 14,004