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Goodwill and Intangible Assets (Changes in Carrying Amounts of Goodwill) (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Feb. 09, 2021 | Mar. 31, 2021
Goodwill [Line Items] |  |
Balance as of January 1, 2021 |  | $ 1,867,430
Goodwill written off related to sale of a business |  | (1,339)
Goodwill reclassified to noncurrent assets held for sale |  | (86,389)
Purchase accounting adjustments |  | 2,790
Foreign exchange translation |  | (4,747)
Balance as of March 31, 2021 |  | 1,777,745
Voice, Backup, Security and CPP |  |
Goodwill [Line Items] |  |
Goodwill written off related to sale of a business | $ (1,300) |
Operating Segments | Total Cloud Services |  |
Goodwill [Line Items] |  |
Balance as of January 1, 2021 |  | 924,496
Goodwill written off related to sale of a business |  | (1,339)
Goodwill reclassified to noncurrent assets held for sale |  | (86,389)
Purchase accounting adjustments |  | 254
Foreign exchange translation |  | (4,558)
Balance as of March 31, 2021 |  | 832,464
Operating Segments | Fax and Martech |  |
Goodwill [Line Items] |  |
Balance as of January 1, 2021 |  | 425,471
Goodwill written off related to sale of a business |  | 0
Goodwill reclassified to noncurrent assets held for sale |  | 0
Purchase accounting adjustments |  | 0
Foreign exchange translation |  | (2,923)
Balance as of March 31, 2021 |  | 422,548
Operating Segments | Voice, Backup, Security and CPP |  |
Goodwill [Line Items] |  |
Balance as of January 1, 2021 |  | 499,025
Goodwill written off related to sale of a business |  | (1,339)
Goodwill reclassified to noncurrent assets held for sale |  | (86,389)
Purchase accounting adjustments |  | 254
Foreign exchange translation |  | (1,635)
Balance as of March 31, 2021 |  | 409,916
Operating Segments | Digital Media |  |
Goodwill [Line Items] |  |
Balance as of January 1, 2021 |  | 942,934
Goodwill written off related to sale of a business |  | 0
Goodwill reclassified to noncurrent assets held for sale |  | 0
Purchase accounting adjustments |  | 2,536
Foreign exchange translation |  | (189)
Balance as of March 31, 2021 |  | $ 945,281

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