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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | As of December 31, goodwill was as follows:
Goodwill | Integrated Networks - Group A |  | Integrated Networks -Group B |  | Media & Data Network |  | All Other |  | Total
Balance at December 31, 2018 | $ | 139,452 |  |  | $ | 267,059 |  |  | $ | 101,768 |  |  | $ | 224,473 |  |  | $ | 732,752 |
Acquired goodwill | — |  |  | 1,025 |  |  | — |  |  | — |  |  | 1,025 |
Impairment loss recognized | (4,879) |  |  | — |  |  | — |  |  | — |  |  | (4,879) |
Transfer of goodwill between segments (1) | — |  |  | (120) |  |  | 3,612 |  |  | (3,492) |  |  | — |
Foreign currency translation | — |  |  | 423 |  |  | 217 |  |  | 2,153 |  |  | 2,793 |
Balance at December 31, 2019 | $ | 134,573 |  |  | $ | 268,387 |  |  | $ | 105,597 |  |  | $ | 223,134 |  |  | $ | 731,691 |
Acquired goodwill | — |  |  | — |  |  | — |  |  | — |  |  | — |
Disposition | — |  |  | — |  |  | — |  |  | (7,074) |  |  | (7,074) |
Impairment loss recognized | — |  |  | (16,137) |  |  | (5,287) |  |  | (40,237) |  |  | (61,661) |
Transfer of goodwill between segments | — |  |  | 19,696 |  |  | 4,546 |  |  | (24,242) |  |  | — |
Foreign currency translation | — |  |  | 212 |  |  | 538 |  |  | 4,505 |  |  | 5,255 |
Balance at December 31, 2020 | $ | 134,573 |  |  | $ | 272,158 |  |  | $ | 105,394 |  |  | $ | 156,086 |  |  | $ | 668,211 |
(1) Transfers of goodwill relate to changes in segments.
Schedule of Intangible Assets and Goodwill | The gross and net amounts of acquired intangible assets other than goodwill as of December 31,
Intangible Assets |  | 2020 |  | 2019
Trademark (indefinite life) |  | $ | — |  |  | $ | 14,600 |
Customer relationships – gross |  | $ | 52,594 |  |  | $ | 58,211 |
Less accumulated amortization |  | (32,667) |  |  | (32,671) |
Customer relationships – net |  | $ | 19,927 |  |  | $ | 25,540 |
Trademarks (definite life) – gross |  | $ | 32,711 |  |  | $ | 28,695 |
Less accumulated amortization |  | (18,794) |  |  | (13,942) |
Trademarks (definite life) – net |  | $ | 13,917 |  |  | $ | 14,753 |
Total intangible assets |  | $ | 85,305 |  |  | $ | 101,506 |
Less accumulated amortization |  | (51,461) |  |  | (46,613) |
Total intangible assets – net |  | $ | 33,844 |  |  | $ | 54,893 |
Finite-lived Intangible Assets Amortization Expense | The estimated amortization expense for the five succeeding years is as follows:
Year |  | Amortization
2021 |  | $ | 8,514 |
2022 |  | 8,062 |
2023 |  | 7,711 |
2024 |  | 4,558 |
Thereafter |  | 4,999 |

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