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ACQUISITIONS - Preliminary Purchase Price (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jan. 05, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill $ 437,181   $ 400,160
Mountain Aviation, LLC      
Business Acquisition [Line Items]      
Current assets   $ 32,884  
Property and equipment   741  
Intangible assets   5,040  
Goodwill   37,021  
Other assets   45,874  
Total assets acquired   121,560  
Total liabilities assumed   (81,388)  
Net assets acquired   $ 40,172