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Intangible Assets, Goodwill and Other Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of 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 |
Schedule of Estimated Amortization Expense | 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 |
Schedule of 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.

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