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Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Schedule of Components of Intangible Assets | The following table summarizes the components of our intangible assets at the dates indicated:
| March 31, 2019 |  | December 31, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Intangibles associated with lease (1) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 13,260 |  |  | $ | 5,407 |  |  | $ | 7,853 |
Marine contract intangibles | 27,800 |  |  | 18,953 |  |  | 8,847 |  |  | 27,800 |  |  | 17,593 |  |  | 10,207 |
Offshore pipeline contract intangibles | 158,101 |  |  | 30,511 |  |  | 127,590 |  |  | 158,101 |  |  | 28,431 |  |  | 129,670 |
Other | 31,707 |  |  | 17,650 |  |  | 14,057 |  |  | 31,747 |  |  | 16,875 |  |  | 14,872 |
Total | $ | 217,608 |  |  | $ | 67,114 |  |  | $ | 150,494 |  |  | $ | 230,908 |  |  | $ | 68,306 |  |  | $ | 162,602 |
(1) Intangible assets associated with a lease in our onshore facilities & transportation segment are now classified as part of our Right or Use Assets, net as part of our adoption of ASC 842 as of January 1, 2019 (Note 4).
Schedule of Amortization Expense | Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended March 31,
| 2019 |  | 2018
Amortization of intangible assets | $ | 4,289 |  |  | $ | 5,433 |
Schedule of Expected Amortization Expense | We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2019 | $ | 12,882 |
| 2020 | $ | 16,167 |
| 2021 | $ | 10,364 |
| 2022 | $ | 10,205 |
| 2023 | $ | 9,919 |

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