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LEASES (Lease Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Operating lease costs:	$ 27,593	$ 28,118	$ 25,681
Cost of Revenues
Lessee, Lease, Description [Line Items]
Operating lease costs:	11,407	11,926	10,214
Software Development
Lessee, Lease, Description [Line Items]
Operating lease costs:	4,209	3,335	2,721
Selling and Marketing Expense
Lessee, Lease, Description [Line Items]
Operating lease costs:	8,678	9,068	8,279
General and Administrative Expense
Lessee, Lease, Description [Line Items]
Operating lease costs:	$ 3,299	$ 3,789	$ 4,467

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

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