LEASES (Lease Cost) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Cost of Revenues [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 3,238
Software Development [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	952
Selling and Marketing [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	2,191
General and Administrative [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 292