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BUSINESS ACQUISITIONS - Summary of Acquisition Related Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Combinations [Abstract]        
Professional and services fees (acquisition-related) $ 1,003 $ 743 $ 14,017 $ 2,569
Integration-related expenses 363 954 590 4,292
Total $ 1,366 $ 1,697 $ 14,607 $ 6,861