REVENUE FROM CONTRACTS WITH CUSTOMERS , COMMISSIONS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Commissions	$ 17,229	$ 19,338
Amortization of deferred commissions costs	12,407	12,006
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Commissions	18,551	23,595
Amortization of deferred commissions costs	12,407	12,006
Restatement Adjustment [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Commissions	$ (13,729)	$ (16,263)