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ACQUISITIONS & DIVESTITURES - PRO FORMA INFORMATION (Details) - HighPoint Merger - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition [Line Items]      
Total revenue $ 126,163 $ 492,176 $ 345,626
Net income (loss) $ 16,030 $ (26,058) $ (1,007,643)
Net income (loss) per common share:      
Basic (in dollars per share) $ 0.52 $ (0.84) $ (32.98)
Diluted (in dollars per share) $ 0.52 $ (0.84) $ (32.98)