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Other Intangible Assets | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Other Intangible Assets | Other Intangible Assets Our identifiable intangible assets are as follows (in thousands):
|  |  | As of December 31, 2023 |  | As of December 31, 2022
| Useful Life |  | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 11.6 years |  | $ | 210,000 |  |  | $ | (28,664) |  |  | $ | 181,336 |  |  | $ | 210,000 |  |  | $ | (10,560) |  |  | $ | 199,440 |
Marketing contract | 20 years |  | 144,219 |  |  | (42,064) |  |  | 102,155 |  |  | 144,219 |  |  | (34,853) |  |  | 109,366 |
Rights-of-way assets | 8 - 35 years |  | 14,892 |  |  | (1,078) |  |  | 13,814 |  |  | 13,490 |  |  | (377) |  |  | 13,113 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Rights-of-way assets | Indefinite |  | 45,722 |  |  |  |  | 45,722 |  |  | 42,877 |  |  |  |  | 42,877 |
Total |  |  | $ | 414,833 |  |  | $ | (71,806) |  |  | $ | 343,027 |  |  | $ | 410,586 |  |  | $ | (45,790) |  |  | $ | 364,796 |
Amortization of the rights-of-way assets and customer relationships intangible asset was $18.7 million for the year ended December 31, 2023, and is included in depreciation and amortization on the accompanying consolidated statements of income and comprehensive income. Amortization of the marketing contract was $7.2 million during the years ended December 31, 2023, 2022 and 2021, and is included as a reduction of net revenue on the accompanying consolidated statements of income and comprehensive income. Amortization expense is estimated to be $0.6 million $7.2 million and $18.1 million for the rights-of-way assets, marketing contract intangible and the customer relationship intangible, respectively, for each of the years ended December 31, 2024 through 2028.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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