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Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
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, 2021 |  | December 31, 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Marine contract intangibles | $ | 800 |  |  | $ | 580 |  |  | $ | 220 |  |  | $ | 800 |  |  | $ | 571 |  |  | $ | 229 |
Offshore pipeline contract intangibles | 158,101 |  |  | 47,153 |  |  | 110,948 |  |  | 158,101 |  |  | 45,073 |  |  | 113,028 |
Other | 30,949 |  |  | 14,269 |  |  | 16,680 |  |  | 29,244 |  |  | 13,759 |  |  | 15,485 |
Total | $ | 189,850 |  |  | $ | 62,002 |  |  | $ | 127,848 |  |  | $ | 188,145 |  |  | $ | 59,403 |  |  | $ | 128,742 |
Schedule of Amortization Expense | Our amortization of intangible assets for the periods presented was as follows:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
Amortization of intangible assets |  |  |  |  | $ | 2,600 |  |  | $ | 4,116 |
Schedule of Expected Amortization Expense | We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2021 | $ | 8,323 |
| 2022 | $ | 10,973 |
| 2023 | $ | 10,705 |
| 2024 | $ | 10,390 |
| 2025 | $ | 10,222 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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