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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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