LEASES (Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 8,003	$ 6,673
Cost of Revenues [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	2,894	3,238
Software Development [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	1,396	952
Selling and Marketing [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	2,539	2,191
General and Administrative [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 1,174	$ 292