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Intangible Assets, Goodwill and Other Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | The following table reflects the components of intangible assets being amortized at December 31, 2020 and 2019:
|  |  | December 31, 2020 |  | December 31, 2019
| Weighted Amortization Period in Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Marine contract intangibles(1) | 20 |  | $ | 800 |  |  | $ | 571 |  |  | $ | 229 |  |  | $ | 27,800 |  |  | $ | 23,033 |  |  | $ | 4,767 |
Offshore pipeline contract intangibles | 19 |  | 158,101 |  |  | 45,073 |  |  | 113,028 |  |  | 158,101 |  |  | 36,752 |  |  | 121,349 |
Other | 9 |  | 29,244 |  |  | 13,759 |  |  | 15,485 |  |  | 34,291 |  |  | 21,480 |  |  | 12,811 |
Total |  |  | $ | 188,145 |  |  | $ | 59,403 |  |  | $ | 128,742 |  |  | $ | 220,192 |  |  | $ | 81,265 |  |  | $ | 138,927 |
(1) The marine contract intangible associated with the M/T American Phoenix became fully amortized and retired as of September 30, 2020.
Schedule of Estimated Amortization Expense | The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
| 2021 |  | 2022 |  | 2023 |  | 2024 |  | 2025
Marine contract intangibles | $ | 37 |  |  | $ | 35 |  |  | $ | 34 |  |  | $ | 33 |  |  | $ | 31 |
Offshore pipeline contract intangibles | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |
Other | 2,595 |  |  | 2,438 |  |  | 2,171 |  |  | 1,857 |  |  | 1,691 |
Total | $ | 10,953 |  |  | $ | 10,794 |  |  | $ | 10,526 |  |  | $ | 10,211 |  |  | $ | 10,043 |
Schedule of Other Assets | Other assets consisted of the following:
| December 31,
| 2020 |  | 2019
Deferred marine charges, net (1) | $ | 20,714 |  |  | $ | 24,098 |
Long-term contract assets (2) | 12,065 |  |  | 54,232 |
Other deferred costs (3) | 13,068 |  |  | 15,755 |
Other assets, net of amortization | $ | 45,847 |  |  | $ | 94,085 |
(1) See discussion of deferred charges on marine transportation assets in the Summary of Accounting Policies (Note 2) (2) See Revenue Recognition (Note 3) for discussion on the circumstances that result in the recognition of contract assets. (3) Includes unamortized debt issuance costs associated with our senior secured credit facility, which were $5.8 million and $7.6 million as of December 31, 2020 and December 31, 2019, respectively. (Note 10)

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