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Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 17, 2021 | Feb. 09, 2021 | Aug. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | $ 1,525,000 | $ 1,313,101 |
Goodwill acquired |  |  |  | 97,032 | 202,901 |
Goodwill written off related to sale of a business |  |  |  | (50,277) | (4,751) |
Purchase accounting adjustments |  |  |  | (932) | 7,591 |
Foreign exchange translation |  |  |  | (6,739) | 6,158 |
Goodwill impairment on business |  |  |  | (32,629) | 0 | $ 0
Ending balance |  |  |  | 1,531,455 | 1,525,000 | 1,313,101
Disposal Group, Disposed of by Sale, Not Discontinued Operations | B2B Backup Business |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill written off related to sale of a business | $ (49,000) |  |  |  |  |
Goodwill impairment on business |  |  |  | (32,600) |  |
Cybersecurity and Martech |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 582,066 |  |
Ending balance |  |  |  | 534,796 | 582,066 |
Digital Media |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 942,934 |  |
Ending balance |  |  |  | 996,659 | 942,934 |
Voice, Backup, Security and CPP Segment |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill written off related to sale of a business |  | $ (1,300) |  |  |  |
Reportable segments | Cybersecurity and Martech |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 582,066 | 557,940 |
Goodwill acquired |  |  |  | 41,328 | 24,950 |
Goodwill written off related to sale of a business |  |  |  | (50,277) | (4,751) |
Purchase accounting adjustments |  |  |  | 505 | (2,130) |
Foreign exchange translation |  |  |  | (6,197) | 6,057 |
Goodwill impairment on business |  |  |  | (32,629) |  |
Ending balance |  |  |  | 534,796 | 582,066 | 557,940
Reportable segments | Digital Media |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Beginning balance |  |  |  | 942,934 | 755,161 |
Goodwill acquired |  |  |  | 55,704 | 177,951 |
Goodwill written off related to sale of a business |  |  |  | 0 | 0 |
Purchase accounting adjustments |  |  |  | (1,437) | 9,721 |
Foreign exchange translation |  |  |  | (542) | 101 |
Goodwill impairment on business |  |  |  | 0 |  |
Ending balance |  |  |  | $ 996,659 | $ 942,934 | $ 755,161
Reportable segments | Voice, Backup, Security and CPP Segment |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill written off related to sale of a business |  |  | $ (4,800) |  |  |

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