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REVENUE - Revenue Stream (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 265,591 | $ 212,546
Revenue recognized at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 93,916 | 63,264
Revenue recognized over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 171,675 | 149,282
Perpetual license | Revenue recognized at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 3,659 | 14,950
Term license | Revenue recognized at a point in time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 90,257 | 48,314
Maintenance | Revenue recognized over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 73,695 | 67,706
Subscription |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 207,418 | 143,778
Cloud | Revenue recognized over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 43,466 | 27,758
Consulting | Revenue recognized over time |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 54,514 | $ 53,818

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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