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Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | Our identifiable intangible assets are as follows (in thousands):
| Useful |  |  |  | Accumulated |  |
As of December 31, 2020 | Life |  | Gross |  | Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |
Marketing contract | 20 |  | 144,219 |  |  | (20,431) |  |  | 123,788 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |
Rights-of-way assets | Indefinite |  | 36,316 |  |  |  |  | 36,316 |
Total |  |  | $ | 180,535 |  |  | $ | (20,431) |  |  | $ | 160,104 |
| Useful |  |  |  | Accumulated |  |
As of December 31, 2019 | Life |  | Gross |  | Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |
Marketing contract | 20 |  | 144,219 |  |  | (13,220) |  |  | $ | 130,999 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |
Rights-of-way assets | Indefinite |  | 15,597 |  |  |  |  | 15,597 |
Total |  |  | $ | 159,816 |  |  | $ | (13,220) |  |  | $ | 146,596 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance by major class. + References No definition available. + Details
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- References No definition available. + Details
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