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Intangible Assets | 9 Months Ended
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Sep. 30, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets The following table summarizes the components of our intangible assets at the dates indicated:
| September 30, 2021 |  | December 31, 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Marine contract intangibles | $ | 800 |  |  | $ | 599 |  |  | $ | 201 |  |  | $ | 800 |  |  | $ | 571 |  |  | $ | 229 |
Offshore pipeline contract intangibles | 158,101 |  |  | 51,313 |  |  | 106,788 |  |  | 158,101 |  |  | 45,073 |  |  | 113,028 |
Other | 35,401 |  |  | 15,242 |  |  | 20,159 |  |  | 29,244 |  |  | 13,759 |  |  | 15,485 |
Total | $ | 194,302 |  |  | $ | 67,154 |  |  | $ | 127,148 |  |  | $ | 188,145 |  |  | $ | 59,403 |  |  | $ | 128,742 |
Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Amortization of intangible assets | $ | 2,575 |  |  | $ | 4,555 |  |  | $ | 7,755 |  |  | $ | 12,817 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2021 | $ | 2,874 |
| 2022 | $ | 11,421 |
| 2023 | $ | 11,153 |
| 2024 | $ | 10,838 |
| 2025 | $ | 10,684 |

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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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- References No definition available. + Details
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