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Revenue from Contracts with Customers - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 581,977 | $ 533,732 | $ 736,654 | $ 691,710
Subscriptions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 501,011 | 445,338 | 608,300 | 557,421
Select Subscription Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 267,249 | 273,745
Enterprise license subscriptions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 165,268 | 135,959 | 184,833 | 182,816
Term license subscriptions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 135,895 | 112,815 | 156,218 | 100,860
Licenses |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 245,639 | 225,921 | 311,689 |
Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 44,946 | 50,139 | 68,661 | 73,224
Professional services (recurring) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 11,624 | 15,682 | 22,797 | 25,981
Professional services (other) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 33,322 | $ 34,457 | $ 45,864 | $ 47,243
Revenue from Rights Concentration Risk [Member] | Revenue Benchmark |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Concentration risk percentage |  |  | 8.00% |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | $ 734,849 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Subscriptions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 613,925 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Select Subscription Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 267,340 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Enterprise license subscriptions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 196,081 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Term license subscriptions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 150,504 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 68,405 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Professional services (recurring) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | 22,974 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Professional services (other) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues |  |  | $ 45,431 |

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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 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: 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=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: 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=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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