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INTANGIBLE ASSETS - Schedule of amortization expense relating to intangible assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
GOODWILL AND INTANGIBLE ASSETS      
Amortization expense $ 20,129 $ 12,168 $ 5,774