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ACQUISITIONS & BUSINESS COMBINATIONS - EnerConnex Acquisition (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Aug. 07, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill $ 706,960   $ 702,070 $ 734,607
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