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Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
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, 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 |
|  | Useful |  |  |  | Accumulated |  |
As of December 31, 2017 |  | Life |  | Gross |  | Amortization |  | Net
Intangible assets subject to amortization: |  |  |  |  |  |  |  |
Supply contract |  | 11.5 |  | $ | 12,227 |  |  | $ | (12,138 | ) |  | $ | 89 |
Intangible assets not subject to amortization: |  |  |  |  |  |  |  |
Rights-of-way assets |  | Indefinite |  | 15,828 |  |  |  |  | 15,828 |
Total |  |  |  | $ | 28,055 |  |  | $ | (12,138 | ) |  | $ | 15,917 |
Amortization of intangible assets was $6.1 million during the year ended December 31, 2018 and $1.1 million during each of the years ended December 31, 2017 and 2016, and is included in depreciation and amortization with respect to the supply contract and as a component of net revenue with respect to the marketing contract 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, 2019 through 2023.

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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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