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BUSINESS ACQUISITIONS - Unaudited Pro Forma Results (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Combinations [Abstract]        
Revenue $ 231,118 $ 232,926 $ 624,800 $ 673,774
Net income (loss) $ 7,036 $ (4,795) $ (41,345) $ (31,023)
Diluted earnings (loss) per share (in dollars per share) $ 0.05 $ (0.03) $ (0.29) $ (0.22)