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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 408,628 | $ 355,145 | $ 341,293 | $ 311,656 | $ 384,055 | $ 273,012 | $ 250,356 | $ 251,406 | $ 1,416,722 | $ 1,158,829 | $ 1,050,464
Contract liability, revenue recognized |  |  |  |  |  |  |  |  | 153,000 | 135,500 |
Fiscal 2021 Acquisitions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred revenue acquired | $ 9,491 |  |  |  |  |  |  |  | 9,491 |  |
Fiscal 2020 Acquisitions |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred revenue acquired |  |  |  |  | $ 21,918 |  |  |  |  | 21,918 |
Point in time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 42,276 | 27,685 | 32,983
Over time |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,374,446 | 1,131,144 | 1,017,481
Advertising | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Advertising |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 11,000 | 15,500
Subscription and licensing | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Advertising |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 11,000 | 15,500
Subscription and licensing | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 9,500 | 6,000
Other | Revision of Prior Period, Reclassification, Adjustment | Revenue Correction, Subscription And Licensing To Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 9,500 | 6,000
Reportable segments |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,416,722 | 1,158,828 | 1,050,456
Reportable segments | Digital Media |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,069,300 | 811,360 | 710,511
Reportable segments | Digital Media | Advertising |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 838,075 | 627,198 | 531,191
Reportable segments | Digital Media | Subscription and licensing |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 197,354 | 166,219 | 164,052
Reportable segments | Digital Media | Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 33,871 | 17,943 | 15,268
Reportable segments | Cybersecurity and Martech |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 348,611 | 347,697 | 340,245
Reportable segments | Cybersecurity and Martech | Subscription and licensing |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 348,611 | 347,697 | 340,245
Reportable segments | Cybersecurity and Martech | Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Corporate, Non-Segment |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 1 | 8
Intersegment Eliminations |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ (1,189) | $ (229) | $ (300)

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