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LEASES - Lease Cost (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Fixed lease cost $ 3,996
Variable lease cost 525
Net lease cost 4,521
Short-term lease cost 300
Selling and marketing expense  
Lessee, Lease, Description [Line Items]  
Fixed lease cost 1,911
Variable lease cost 304
General and administrative expense  
Lessee, Lease, Description [Line Items]  
Fixed lease cost 1,785
Variable lease cost 191
Product development expense  
Lessee, Lease, Description [Line Items]  
Fixed lease cost 300
Variable lease cost $ 30