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Intangible Assets | 9 Months Ended
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Sep. 30, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets The following table summarizes the components of our intangible assets at the dates indicated:
| September 30, 2018 |  | December 31, 2017
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Sodium minerals and sulfur services: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 94,654 |  |  | $ | 94,114 |  |  | $ | 540 |  |  | $ | 94,654 |  |  | $ | 92,493 |  |  | $ | 2,161 |
Licensing agreements | 38,678 |  |  | 38,141 |  |  | 537 |  |  | 38,678 |  |  | 36,528 |  |  | 2,150 |
Non-compete agreement | 800 |  |  | 289 |  |  | 511 |  |  | 800 |  |  | 89 |  |  | 711 |
Segment total | 134,132 |  |  | 132,544 |  |  | 1,588 |  |  | 134,132 |  |  | 129,110 |  |  | 5,022 |
Onshore Facilities & Transportation: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 35,113 |  |  | 317 |  |  | 35,430 |  |  | 35,082 |  |  | 348 |
Intangibles associated with lease | 13,260 |  |  | 5,288 |  |  | 7,972 |  |  | 13,260 |  |  | 4,933 |  |  | 8,327 |
Segment total | 48,690 |  |  | 40,401 |  |  | 8,289 |  |  | 48,690 |  |  | 40,015 |  |  | 8,675 |
Marine contract intangibles | 27,000 |  |  | 15,750 |  |  | 11,250 |  |  | 27,000 |  |  | 11,700 |  |  | 15,300 |
Offshore pipeline contract intangibles | 158,101 |  |  | 26,350 |  |  | 131,751 |  |  | 158,101 |  |  | 20,109 |  |  | 137,992 |
Other | 31,149 |  |  | 15,736 |  |  | 15,413 |  |  | 28,900 |  |  | 13,483 |  |  | 15,417 |
Total | $ | 399,072 |  |  | $ | 230,781 |  |  | $ | 168,291 |  |  | $ | 396,823 |  |  | $ | 214,417 |  |  | $ | 182,406 |
Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Amortization of intangible assets | $ | 5,475 |  |  | $ | 5,879 |  |  | $ | 16,369 |  |  | $ | 17,623 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2018 | $ | 5,503 |
| 2019 | $ | 17,679 |
| 2020 | $ | 16,665 |
| 2021 | $ | 10,867 |
| 2022 | $ | 10,708 |

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- Definition The entire disclosure for all or part of the information related to 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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- References No definition available. + Details
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