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DEFERRED COMMISSIONS - Schedule of Amortization of Deferred Commissions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Amortization of deferred commissions $ 33,302 $ 29,152 $ 17,271