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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. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Goodwill [Line Items] |  |  |  |
Beginning balance |  |  | $ 1,546,065 |
Goodwill acquired |  |  | 112,534 |
Goodwill removed due to sale of businesses |  |  | (3,983) |
Goodwill impairment | $ (85,273) | $ (56,850) | (85,273) | $ (56,850)
Foreign exchange translation |  |  | 3,511 |
Ending balance | 1,572,854 |  | 1,572,854 |
Digital Media |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill impairment | (85,300) | $ (56,900) | (85,300) | $ (56,900)
Operating Segments | Digital Media |  |  |  |
Goodwill [Line Items] |  |  |  |
Beginning balance |  |  | 1,016,880 |
Goodwill acquired |  |  | 112,534 |
Goodwill removed due to sale of businesses |  |  | (3,983) |
Goodwill impairment |  |  | (85,273) |
Foreign exchange translation |  |  | 1,180 |
Ending balance | 1,041,338 |  | 1,041,338 |
Operating Segments | Cybersecurity and Martech |  |  |  |
Goodwill [Line Items] |  |  |  |
Beginning balance |  |  | 529,185 |
Goodwill acquired |  |  | 0 |
Goodwill removed due to sale of businesses |  |  | 0 |
Goodwill impairment |  |  | 0 |
Foreign exchange translation |  |  | 2,331 |
Ending balance | $ 531,516 |  | $ 531,516 |

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