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Intangible Assets, Goodwill and Other Assets | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Goodwill and Other Assets | Intangible Assets, Goodwill and Other Assets Intangible Assets The following table reflects the components of intangible assets being amortized at December 31, 2021 and 2020:
|  |  | December 31, 2021 |  | December 31, 2020
| Weighted Amortization Period in Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Marine contract intangibles | 20 |  | $ | 800 |  |  | $ | 607 |  |  | $ | 193 |  |  | $ | 800 |  |  | $ | 571 |  |  | $ | 229 |
Offshore pipeline contract intangibles | 19 |  | 158,101 |  |  | 53,394 |  |  | 104,707 |  |  | 158,101 |  |  | 45,073 |  |  | 113,028 |
Other | 9 |  | 37,933 |  |  | 15,770 |  |  | 22,163 |  |  | 29,244 |  |  | 13,759 |  |  | 15,485 |
Total |  |  | $ | 196,834 |  |  | $ | 69,771 |  |  | $ | 127,063 |  |  | $ | 188,145 |  |  | $ | 59,403 |  |  | $ | 128,742 |
The offshore pipeline contract intangibles relate to customer contracts surrounding certain transportation agreements with producers in the Lucius production area in Southeast Keathley Canyon, which support our SEKCO pipeline. We are recording amortization of our intangible assets based on the period over which the asset is expected to contribute to our future cash flows. All of our current intangible assets are being amortized on a straight-line basis. Amortization expense on intangible assets was $10.3 million, $15.5 million and $18.7 million for the years ended December 31, 2021, 2020 and 2019, respectively. The decline in amortization expense during 2021 was primarily attributable to our contract intangible associated with the M/T American Phoenix becoming fully amortized at September 30, 2020. The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
| 2022 |  | 2023 |  | 2024 |  | 2025 |  | 2026
Marine contract intangibles | $ | 35 |  |  | $ | 34 |  |  | $ | 33 |  |  | $ | 32 |  |  | $ | 30 |
Offshore pipeline contract intangibles | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |
Other | 3,414 |  |  | 3,147 |  |  | 2,783 |  |  | 2,560 |  |  | 2,261 |
Total | $ | 11,770 |  |  | $ | 11,502 |  |  | $ | 11,137 |  |  | $ | 10,913 |  |  | $ | 10,612 |
Goodwill The carrying amount of goodwill in our sodium minerals and sulfur services segment was $301.9 million at December 31, 2021 and 2020. We have not recognized any impairment losses related to goodwill for any of the periods presented. Other Assets Other assets consisted of the following:
| December 31,
| 2021 |  | 2020
Deferred marine charges, net (1) | $ | 19,930 |  |  | $ | 20,714 |
Long-term contract assets (2) | — |  |  | 12,065 |
Unamortized debt issuance costs on Revolving Loan | 4,736 |  |  | 5,842 |
Other deferred costs | 13,593 |  |  | 7,226 |
Other assets, net of amortization | $ | 38,259 |  |  | $ | 45,847 |
(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.

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- Definition The entire disclosure for goodwill and 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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