LEASES (Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 7,960	$ 7,308	$ 15,963	$ 13,981
Cost of Revenues [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	2,846	3,152	5,740	6,390
Software Development [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	1,388	1,027	2,784	1,979
Selling and Marketing [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	2,550	2,179	5,089	4,370
General and Administrative [Member]
Lessee, Lease, Description [Line Items]
Total operating lease costs	$ 1,176	$ 950	$ 2,350	$ 1,242