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Intangible Assets | 6 Months Ended
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Jun. 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:
| June 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 |  |  | $ | 93,574 |  |  | $ | 1,080 |  |  | $ | 94,654 |  |  | $ | 92,493 |  |  | $ | 2,161 |
Licensing agreements | 38,678 |  |  | 37,603 |  |  | 1,075 |  |  | 38,678 |  |  | 36,528 |  |  | 2,150 |
Non-compete agreement | 800 |  |  | 222 |  |  | 578 |  |  | 800 |  |  | 89 |  |  | 711 |
Segment total | 134,132 |  |  | 131,399 |  |  | 2,733 |  |  | 134,132 |  |  | 129,110 |  |  | 5,022 |
Onshore Facilities & Transportation: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 35,103 |  |  | 327 |  |  | 35,430 |  |  | 35,082 |  |  | 348 |
Intangibles associated with lease | 13,260 |  |  | 5,170 |  |  | 8,090 |  |  | 13,260 |  |  | 4,933 |  |  | 8,327 |
Segment total | 48,690 |  |  | 40,273 |  |  | 8,417 |  |  | 48,690 |  |  | 40,015 |  |  | 8,675 |
Marine contract intangibles | 27,000 |  |  | 14,400 |  |  | 12,600 |  |  | 27,000 |  |  | 11,700 |  |  | 15,300 |
Offshore pipeline contract intangibles | 158,101 |  |  | 24,270 |  |  | 133,831 |  |  | 158,101 |  |  | 20,109 |  |  | 137,992 |
Other | 31,074 |  |  | 14,970 |  |  | 16,104 |  |  | 28,900 |  |  | 13,483 |  |  | 15,417 |
Total | $ | 398,997 |  |  | $ | 225,312 |  |  | $ | 173,685 |  |  | $ | 396,823 |  |  | $ | 214,417 |  |  | $ | 182,406 |
Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Amortization of intangible assets | $ | 5,461 |  |  | $ | 5,872 |  |  | $ | 10,894 |  |  | $ | 11,744 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2018 | $ | 11,003 |
| 2019 | $ | 16,155 |
| 2020 | $ | 16,750 |
| 2021 | $ | 11,378 |
| 2022 | $ | 10,768 |

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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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