SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Estimated Revenue from Prepaid Gift Cards Expected to be Recognized in Future Related to Performance Obligations) (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 7,179
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-10-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 5,559
Revenue, Remaining Performance Obligations, Expected Timing of Satisfaction, Period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 1,561
Revenue, Remaining Performance Obligations, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 59
Revenue, Remaining Performance Obligations, Expected Timing of Satisfaction, Period	1 year