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INTANGIBLE ASSETS - Schedule of amortization expense relating to intangible assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
GOODWILL AND INTANGIBLE ASSETS        
Amortization expense $ 5,049 $ 3,002 $ 15,064 $ 6,849