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Goodwill and Intangible Assets (Changes in Carrying Amounts of Goodwill) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 17, 2021 | Feb. 09, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Goodwill [Roll Forward] |  |  |  |  |  |
Balance as of January 1, 2021 |  |  |  |  | $ 1,867,430 |
Goodwill acquired (Note 4) |  |  |  |  | 85,552 |
Goodwill removed due to sale of businesses |  |  |  |  | (50,276) |
Goodwill impairment |  |  | $ 0 | $ 0 | (32,629) | $ 0
Purchase accounting adjustments |  |  |  |  | (963) |
Foreign exchange translation |  |  |  |  | (7,782) |
Balance as of September 30, 2021 |  |  | 1,861,332 |  | 1,861,332 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | B2B Backup Business |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill removed due to sale of businesses | $ (49,000) |  |  |  |  |
Goodwill impairment |  |  |  |  | (32,600) |
Voice, Backup, Security and CPP |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Goodwill removed due to sale of businesses |  | $ (1,300) |  |  |  |
Purchase accounting adjustments |  |  |  |  | 500 |
Digital Media |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Purchase accounting adjustments |  |  |  |  | (1,500) |
Operating Segments | Total Cloud Services |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance as of January 1, 2021 |  |  |  |  | 924,496 |
Goodwill acquired (Note 4) |  |  |  |  | 41,152 |
Goodwill removed due to sale of businesses |  |  |  |  | (50,276) |
Goodwill impairment |  |  |  |  | (32,629) |
Purchase accounting adjustments |  |  |  |  | 505 |
Foreign exchange translation |  |  |  |  | (7,352) |
Balance as of September 30, 2021 |  |  | 875,896 |  | 875,896 |
Operating Segments | Fax and Martech |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance as of January 1, 2021 |  |  |  |  | 425,471 |
Goodwill acquired (Note 4) |  |  |  |  | 41,152 |
Goodwill removed due to sale of businesses |  |  |  |  | 0 |
Goodwill impairment |  |  |  |  | 0 |
Purchase accounting adjustments |  |  |  |  | 0 |
Foreign exchange translation |  |  |  |  | (3,462) |
Balance as of September 30, 2021 |  |  | 463,161 |  | 463,161 |
Operating Segments | Voice, Backup, Security and CPP |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance as of January 1, 2021 |  |  |  |  | 499,025 |
Goodwill acquired (Note 4) |  |  |  |  | 0 |
Goodwill removed due to sale of businesses |  |  |  |  | (50,276) |
Goodwill impairment |  |  |  |  | (32,629) |
Purchase accounting adjustments |  |  |  |  | 505 |
Foreign exchange translation |  |  |  |  | (3,890) |
Balance as of September 30, 2021 |  |  | 412,735 |  | 412,735 |
Operating Segments | Digital Media |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |
Balance as of January 1, 2021 |  |  |  |  | 942,934 |
Goodwill acquired (Note 4) |  |  |  |  | 44,400 |
Goodwill removed due to sale of businesses |  |  |  |  | 0 |
Goodwill impairment |  |  |  |  | 0 |
Purchase accounting adjustments |  |  |  |  | (1,468) |
Foreign exchange translation |  |  |  |  | (430) |
Balance as of September 30, 2021 |  |  | $ 985,436 |  | $ 985,436 |

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