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Goodwill and Intangible Assets - Textual (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) reportable_segment | Dec. 31, 2018 USD ($) reportable_segment
Goodwill [Line Items] |  |  |  |  |
Impairment and other losses | $ 77,240 | $ 6,655 | $ 96,399 | $ 8,599 | $ 87,204
Goodwill, Impairment Loss |  |  | 61,661 | 4,879 |
Goodwill | 668,211 | 731,691 | 668,211 | 731,691 | 732,752
Goodwill, impaired, accumulated impairment loss | 238,965 | 177,304 | $ 238,965 | 177,304 |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 8 years |  |
Amortization Of Intangible Assets, Finite Lived |  |  | $ 11,260 | 11,828 | 17,290
Indefinite-Lived Trademarks | 0 | 14,600 | $ 0 | 14,600 |
Customer Relationships |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 8 years |  |
Trademarks |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impairment of Intangible Assets (Excluding Goodwill) | $ 12,071 |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 9 years |  |
Indefinite-Lived Trademarks | $ 14,600 |  | $ 14,600 |  |
Integrated Networks - Group A |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  |  | 0 | 4,879 |
Goodwill | 134,573 | 134,573 | 134,573 | 134,573 | 139,452
Integrated Networks - Group A | Reporting Unit, 1 [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | 14,854 |  | 14,854 |  |
Integrated Networks - Group B |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill, Impairment Loss |  |  | 16,137 | 0 |
Goodwill | 272,158 | 268,387 | 272,158 | $ 268,387 | $ 267,059
Media & Data Network |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Number of Reporting Units | reportable_segment |  |  |  | 1 | 1
Goodwill, Impairment Loss |  |  | 5,287 | $ 0 |
Goodwill | 105,394 | $ 105,597 | 105,394 | $ 105,597 | $ 101,768
All Other | Reporting Unit, 2 [Member] |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill | $ 5,479 |  | $ 5,479 |  |

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