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REVENUE FROM CONTRACTS WITH CUSTOMERS , COMMISSIONS (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]    
Commissions incurred $ 22,437 $ 18,551
Commissions capitalized in the current period (16,523) (13,729)
Amortization of deferred commissions costs 14,747 12,407
Total commissions expense $ 20,661 $ 17,229