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ACQUISITIONS - Pro Forma Revenue (Details) - Series of Individually Immaterial Business Acquisitions - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Business Acquisition [Line Items]    
Business Acquisition, Pro Forma Revenue $ 575,116 $ 1,081,731
Business Acquisition, Pro Forma Net Income (Loss) $ (40,989) $ (26,319)