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Other Intangible Assets | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Other Intangible Assets | Other Intangible Assets Our identifiable intangible assets are as follows (in thousands):
| Useful |  |  |  | Accumulated |  |
As of December 31, 2021 | Life |  | Gross |  | Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |
Marketing contract | 20 |  | $ | 144,219 |  |  | $ | (27,642) |  |  | $ | 116,577 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |
Rights-of-way assets | Indefinite |  | 37,280 |  |  |  |  | 37,280 |
Total |  |  | $ | 181,499 |  |  | $ | (27,642) |  |  | $ | 153,857 |
| 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 |
Amortization of intangible assets was $7.2 million during the years ended December 31, 2021, 2020 and 2019. It is included as a reduction of net revenue on the accompanying consolidated statements of income and comprehensive income. Amortization expense is estimated to be $7.2 million for each of the years ended December 31, 2022 through 2026.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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