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GOODWILL - Schedule of the changes in goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
GOODWILL AND INTANGIBLE ASSETS    
Balance as of Beginning of Period $ 202,932 $ 101,900
Measurement period adjustments to preliminary purchase price allocation 1,957 (41,996)
Additions from acquisition 1,749 143,262
Foreign currency translation 3,345 (234)
Balance as of End of Period $ 209,983 $ 202,932