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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Non-amortizing intangibles | $ 94,433 | $ 94,433
Gross carrying amount | 35,699 | 35,699
Accumulated amortization and other | (27,031) | (26,617)
Total | 8,668 | 9,082
Total intangible assets, gross carrying amount | 133,376 | 133,376
Intangible assets, net | 106,345 | 106,759
Broadband |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill, gross | 3,244 | 3,244
Goodwill | 3,244 | 3,244
FCC spectrum licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 6,811 | 6,811
Accumulated amortization and other | (515) | (340)
Total | 6,296 | 6,471
Subscriber relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 28,425 | 28,425
Accumulated amortization and other | (26,226) | (26,000)
Total | 2,199 | 2,425
Other intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 463 | 463
Accumulated amortization and other | (290) | (277)
Total | 173 | 186
Cable franchise rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Non-amortizing intangibles | 64,334 | 64,334
FCC spectrum licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Non-amortizing intangibles | 29,958 | 29,958
Railroad crossing rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Non-amortizing intangibles | $ 141 | $ 141

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