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ACQUISITIONS & BUSINESS COMBINATIONS - AEP Acquisition (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Aug. 07, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 706,960   $ 702,070
EnerConnex, LLC      
Business Acquisition [Line Items]      
Cash   $ 415  
Accounts Receivable   249  
Identified Intangible Assets   4,500  
Goodwill   4,890  
Other Noncurrent Assets   100  
Total assets acquired   10,154  
Accounts Payable   4  
Other Current Liabilities   150  
Total liabilities assumed   154  
Total net assets acquired   $ 10,000