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LEASES (Lease Cost) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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 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 + Details
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