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Intangible Assets, Goodwill and Other Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | The following table reflects the components of intangible assets being amortized at December 31, 2017 and 2016:
|  |  | December 31, 2017 |  | December 31, 2016
| 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 |  |  | $ | 92,493 |  |  | $ | 2,161 |  |  | $ | 94,654 |  |  | $ | 89,756 |  |  | $ | 4,898 |
Licensing agreements | 6 |  | 38,678 |  |  | 36,528 |  |  | 2,150 |  |  | 38,678 |  |  | 34,204 |  |  | 4,474 |
Non-compete agreement | 3 |  | 800 |  |  | 89 |  |  | 711 |  |  | — |  |  | — |  |  | — |
Segment total |  |  | 134,132 |  |  | 129,110 |  |  | 5,022 |  |  | 133,332 |  |  | 123,960 |  |  | 9,372 |
Onshore Facilities & Transportation: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 5 |  | 35,430 |  |  | 35,082 |  |  | 348 |  |  | 35,430 |  |  | 33,676 |  |  | 1,754 |
Intangibles associated with lease | 15 |  | 13,260 |  |  | 4,933 |  |  | 8,327 |  |  | 13,260 |  |  | 4,459 |  |  | 8,801 |
Segment total |  |  | 48,690 |  |  | 40,015 |  |  | 8,675 |  |  | 48,690 |  |  | 38,135 |  |  | 10,555 |
Marine contract intangible | 5 |  | 27,000 |  |  | 11,700 |  |  | 15,300 |  |  | 27,000 |  |  | 6,300 |  |  | 20,700 |
Offshore pipeline contract intangibles | 19 |  | 158,101 |  |  | 20,109 |  |  | 137,992 |  |  | 158,101 |  |  | 11,788 |  |  | 146,313 |
Other | 5 |  | 28,900 |  |  | 13,483 |  |  | 15,417 |  |  | 28,569 |  |  | 10,622 |  |  | 17,947 |
Total |  |  | $ | 396,823 |  |  | $ | 214,417 |  |  | $ | 182,406 |  |  | $ | 395,692 |  |  | $ | 190,805 |  |  | $ | 204,887 |
Schedule of Estimated Amortization Expense | The following table reflects our estimated amortization expense for each of the five subsequent fiscal years:
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022
Sodium Minerals and Sulfur Services: |  |  |  |  |  |  |  |  |
Customer relationships | $ | 2,161 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Licensing agreements | 2,150 |  |  | — |  |  | — |  |  | — |  |  | — |
Non Compete | 267 |  |  | 267 |  |  | 177 |  |  | — |  |  | — |
Onshore Facilities & Transportation: |  |  |  |  |  |  |  |  |
Customer relationships | 41 |  |  | 39 |  |  | 38 |  |  | 37 |  |  | 35 |
Intangibles associated with lease | 474 |  |  | 474 |  |  | 474 |  |  | 474 |  |  | 474 |
Marine contract intangibles | 5,400 |  |  | 5,400 |  |  | 4,500 |  |  | — |  |  | — |
Offshore pipeline contract intangibles | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |  |  | 8,321 |
Other | 2,974 |  |  | 2,952 |  |  | 2,921 |  |  | 1,810 |  |  | 1,652 |
Total | $ | 21,788 |  |  | $ | 17,453 |  |  | $ | 16,431 |  |  | $ | 10,642 |  |  | $ | 10,482 |
Schedule of Other Assets | Other assets consisted of the following:
| December 31,
| 2017 |  | 2016
CO 2 volumetric production payments, net of amortization | $ | 2,175 |  |  | $ | 3,503 |
Deferred marine charges, net (1) | 30,246 |  |  | 27,710 |
Other deferred costs and deposits | 24,207 |  |  | 25,398 |
Other assets, net of amortization | $ | 56,628 |  |  | $ | 56,611 |
(1) | See discussion of deferred charges on marine transportation assets in the Summary of Accounting Policies (Note 2)

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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