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BUSINESS COMBINATIONS - AEP Acquisition (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Aug. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 702,070 $ 702,070  
AEP      
Business Acquisition [Line Items]      
Cash     $ 43
Accounts Receivable     116
Other Prepayments and Current Assets     53
Goodwill     1,843
Other Noncurrent Assets     2,400
Total assets acquired     4,455
Accounts Payable     11
Other Current Liabilities     449
Total liabilities assumed     460
Total net assets acquired     $ 3,995