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Intangible Assets, Goodwill and Other Assets | 12 Months Ended
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Dec. 31, 2018
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, 2018 and 2017:
|  |  | December 31, 2018 |  | December 31, 2017
| Weighted Amortization Period in Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Sodium Minerals and Sulfur Services: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 5 |  | $ | 94,654 |  |  | $ | 94,654 |  |  | $ | — |  |  | $ | 94,654 |  |  | $ | 92,493 |  |  | $ | 2,161 |
Licensing agreements | 6 |  | 38,678 |  |  | 38,678 |  |  | — |  |  | 38,678 |  |  | 36,528 |  |  | 2,150 |
Non-compete agreement | 3 |  | 800 |  |  | 356 |  |  | 444 |  |  | 800 |  |  | 89 |  |  | 711 |
Segment total |  |  | 134,132 |  |  | 133,688 |  |  | 444 |  |  | 134,132 |  |  | 129,110 |  |  | 5,022 |
Onshore Facilities & Transportation: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 5 |  | 35,430 |  |  | 35,123 |  |  | 307 |  |  | 35,430 |  |  | 35,082 |  |  | 348 |
Intangibles associated with lease | 15 |  | 13,260 |  |  | 5,407 |  |  | 7,853 |  |  | 13,260 |  |  | 4,933 |  |  | 8,327 |
Segment total |  |  | 48,690 |  |  | 40,530 |  |  | 8,160 |  |  | 48,690 |  |  | 40,015 |  |  | 8,675 |
Marine contract intangible | 5 |  | 27,000 |  |  | 17,100 |  |  | 9,900 |  |  | 27,000 |  |  | 11,700 |  |  | 15,300 |
Offshore pipeline contract intangibles | 19 |  | 158,101 |  |  | 28,431 |  |  | 129,670 |  |  | 158,101 |  |  | 20,109 |  |  | 137,992 |
Other | 5 |  | 30,947 |  |  | 16,519 |  |  | 14,428 |  |  | 28,900 |  |  | 13,483 |  |  | 15,417 |
Total |  |  | $ | 398,870 |  |  | $ | 236,268 |  |  | $ | 162,602 |  |  | $ | 396,823 |  |  | $ | 214,417 |  |  | $ | 182,406 |
The licensing agreements referred to in the table above relate to the agreements we have with refiners to provide services. The onshore facilities and transportation lease relates to a terminal facility in Shreveport, Louisiana. The marine contract intangible 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 identified in connection with our purchase price allocation surrounding the Enterprise Acquisition. 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. Generally, the contribution to our cash flows of the customer and supplier relationships, licensing agreements and trade name intangible assets is expected to decline over time, such that greater value is attributable to the periods shortly after the acquisition was made. The onshore facilities and transportation lease, marine contract, offshore pipeline contract intangibles and other intangible assets are being amortized on a straight-line basis. Amortization expense on intangible assets was $21.8 million, $23.6 million and $24.3 million for the years ended December 31, 2018, 2017 and 2016, respectively. The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023
Sodium Minerals and Sulfur Services: |  |  |  |  |  |  |  |  |
Non Compete | 267 |  |  | 177 |  |  | — |  |  | — |  |  | — |
Onshore Facilities & Transportation: |  |  |  |  |  |  |  |  |
Customer relationships | 39 |  |  | 38 |  |  | 37 |  |  | 35 |  |  | 34 |
Intangibles associated with lease | 474 |  |  | 474 |  |  | 474 |  |  | 474 |  |  | 474 |
Marine contract intangibles | 5,400 |  |  | 4,500 |  |  | — |  |  | — |  |  | — |
Offshore pipeline contract intangibles | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |
Other | 3,153 |  |  | 3,132 |  |  | 2,011 |  |  | 1,853 |  |  | 1,568 |
Total | $ | 17,654 |  |  | $ | 16,642 |  |  | $ | 10,843 |  |  | $ | 10,683 |  |  | $ | 10,397 |
Goodwill The carrying amount of goodwill in sodium minerals and sulfur services was $301.9 million in December 31, 2018 and 2017. 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,
| 2018 |  | 2017
CO 2 volumetric production payments, net of amortization | $ | 890 |  |  | $ | 2,175 |
Deferred marine charges, net (1) | 28,175 |  |  | 30,246 |
Contract assets (2) | 72,241 |  |  | — |
Other deferred costs and deposits | 20,401 |  |  | 24,207 |
Other assets, net of amortization | $ | 121,707 |  |  | $ | 56,628 |
(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 are being amortized on a units-of-production method. We recorded amortization of $1.3 million in 2018, $1.3 million in 2017 and $3.9 million in 2016.

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