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Intangible Assets, Goodwill and Other Assets | 12 Months Ended
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Dec. 31, 2020
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, 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. 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 $15.5 million, $18.7 million and $21.8 million for the years ended December 31, 2020, 2019 and 2018, respectively. 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 |
Goodwill The carrying amount of goodwill in our sodium minerals and sulfur services segment was $301.9 million at December 31, 2020 and 2019. During 2018, we recognized a goodwill impairment loss of $23.1 million related to our onshore facilities and transportation segment during the period. The goodwill impairment was specifically related to our supply and logistics reporting unit, that primarily includes our legacy crude oil and refined products marketing and trucking businesses. Due to our efforts to rightsize these businesses, along with the volatility of crude oil prices and the impact this volatility has on the availability of crude oil and heavy refined products for us to market, the fair value of the reporting unit was determined to be lower than the carrying value of the reporting unit, including goodwill. The fair value was derived using a discounted cash flow present value technique. 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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- 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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