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Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |
Beginning Balance | $ 731,691 | $ 732,752
Acquired goodwill | 0 | 1,025
Impairment loss recognized | (61,661) | (4,879)
Transfer of goodwill between segments | 0 | 0
Disposition | (7,074) |
Foreign currency translation | 5,255 | 2,793
Ending Balance | 668,211 | 731,691
Integrated Networks - Group A |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 134,573 | 139,452
Acquired goodwill | 0 | 0
Impairment loss recognized | 0 | (4,879)
Transfer of goodwill between segments | 0 | 0
Disposition | 0 |
Foreign currency translation | 0 | 0
Ending Balance | 134,573 | 134,573
Integrated Networks - Group B |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 268,387 | 267,059
Acquired goodwill | 0 | 1,025
Impairment loss recognized | (16,137) | 0
Transfer of goodwill between segments | 19,696 | (120)
Disposition | 0 |
Foreign currency translation | 212 | 423
Ending Balance | 272,158 | 268,387
Media & Data Network |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 105,597 | 101,768
Acquired goodwill | 0 | 0
Impairment loss recognized | (5,287) | 0
Transfer of goodwill between segments | 4,546 | 3,612
Disposition | 0 |
Foreign currency translation | 538 | 217
Ending Balance | 105,394 | 105,597
All Other [Domain] |  |
Goodwill [Roll Forward] |  |
Beginning Balance | 223,134 | 224,473
Acquired goodwill | 0 | 0
Impairment loss recognized | (40,237) | 0
Transfer of goodwill between segments | (24,242) | (3,492)
Disposition | (7,074) |
Foreign currency translation | 4,505 | 2,153
Ending Balance | $ 156,086 | $ 223,134

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