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Intangible Assets | 9 Months Ended
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Sep. 30, 2020
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, 2020 |  | December 31, 2019
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Marine contract intangibles(1) | $ | 800 |  |  | $ | 561 |  |  | $ | 239 |  |  | $ | 27,800 |  |  | $ | 23,033 |  |  | $ | 4,767 |
Offshore pipeline contract intangibles | 158,101 |  |  | 42,992 |  |  | 115,109 |  |  | 158,101 |  |  | 36,752 |  |  | 121,349 |
Other | 27,009 |  |  | 13,179 |  |  | 13,830 |  |  | 34,291 |  |  | 21,480 |  |  | 12,811 |
Total | $ | 185,910 |  |  | $ | 56,732 |  |  | $ | 129,178 |  |  | $ | 220,192 |  |  | $ | 81,265 |  |  | $ | 138,927 |
(1) The contract intangible associated with the M/T American Phoenix became fully amortized and retired as of September 30, 2020. Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Amortization of intangible assets | $ | 4,555 |  |  | $ | 4,928 |  |  | $ | 12,817 |  |  | $ | 14,029 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2020 | $ | 2,781 |
| 2021 | $ | 10,729 |
| 2022 | $ | 10,571 |
| 2023 | $ | 10,303 |
| 2024 | $ | 9,988 |

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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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