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Intangible Assets, Goodwill and Other Assets | 12 Months Ended
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Dec. 31, 2019
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, 2019 and 2018:
|  |  | December 31, 2019 |  | December 31, 2018
| Weighted Amortization Period in Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Intangible associated with lease (1) | 15 |  | — |  |  | — |  |  | — |  |  | 13,260 |  |  | 5,407 |  |  | 7,853 |
Marine contract intangibles | 5 |  | 27,800 |  |  | 23,033 |  |  | 4,767 |  |  | 27,800 |  |  | 17,593 |  |  | 10,207 |
Offshore pipeline contract intangibles | 19 |  | 158,101 |  |  | 36,752 |  |  | 121,349 |  |  | 158,101 |  |  | 28,431 |  |  | 129,670 |
Other | 9 |  | 34,291 |  |  | 21,480 |  |  | 12,811 |  |  | 31,747 |  |  | 16,875 |  |  | 14,872 |
Total |  |  | $ | 220,192 |  |  | $ | 81,265 |  |  | $ | 138,927 |  |  | $ | 230,908 |  |  | $ | 68,306 |  |  | $ | 162,602 |
(1) Intangible assets associated with a lease in our onshore facilities & transportation segment are now classified as part of our Right or Use Assets, net as part of our adoption of ASC 842 as of January 1, 2019 (Note 4). The marine contract intangible primarily relates to the contracts we assumed in the purchase of the M/T American Phoenix in November 2014. 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 $18.7 million, $21.8 million and $23.6 million for the years ended December 31, 2019, 2018 and 2017, respectively. The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
| 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024
Marine contract intangibles | 4,538 |  |  | 37 |  |  | 35 |  |  | 34 |  |  | 33 |
Offshore pipeline contract intangibles | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |
Other | 2,453 |  |  | 2,168 |  |  | 2,010 |  |  | 1,621 |  |  | 1,421 |
Total | $ | 15,312 |  |  | $ | 10,526 |  |  | $ | 10,366 |  |  | $ | 9,976 |  |  | $ | 9,775 |
Goodwill The carrying amount of goodwill in our sodium minerals and sulfur services segment was $301.9 million in December 31, 2019 and 2018. 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,
| 2019 |  | 2018
CO 2 volumetric production payments, net of amortization | $ | — |  |  | $ | 890 |
Deferred marine charges, net (1) | 24,098 |  |  | 28,175 |
Contract assets (2) | 54,232 |  |  | 72,241 |
Other deferred costs | 15,755 |  |  | 20,401 |
Other assets, net of amortization | $ | 94,085 |  |  | $ | 121,707 |
(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.
The CO 2 assets were being amortized on a units-of-production method and became fully amortized as of December 31, 2019.

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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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