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Other Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Other 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, 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 |
| Useful |  |  |  | Accumulated |  |
As of December 31, 2018 | Life |  | Gross |  | Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |
Supply contract | 11.5 |  | 12,227 |  |  | (12,227 | ) |  | $ | — |
Marketing contract | 20 |  | 144,219 |  |  | (6,009 | ) |  | $ | 138,210 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |
Rights-of-way assets | Indefinite |  | 15,828 |  |  |  |  | 15,828 |
Total |  |  | $ | 172,274 |  |  | $ | (18,236 | ) |  | $ | 154,038 |
Amortization of intangible assets was $7.2 million, $6.1 million and $1.1 million during the years ended December 31, 2019, 2018 and 2017, respectively, and is included as a component 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, 2020 through 2024.

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- Definition Other Intangible Assets Disclosure [Abstract] + References No definition available. + Details
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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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