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Other Intangible Assets, net and Goodwill - Goodwill Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Jan. 01, 2020
Goodwill [Line Items] |  |  |
Acquisition | $ 31,926 | $ 4,501,894 |
Discontinued Operations, Disposed of by Sale | Brand Protection, AntiPiracy, and AntiFraud Solutions |  |  |
Goodwill [Line Items] |  |  |
Purchase price |  |  | $ 3,751
Goodwill, Written off Related to Sale of Business Unit |  | $ 9,129 |

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