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Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Schedule of Components of Intangible Assets | The following table summarizes the components of our intangible assets at the dates indicated:
| September 30, 2017 |  | December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Sodium minerals and sulfur services: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 94,654 |  |  | $ | 91,809 |  |  | $ | 2,845 |  |  | $ | 94,654 |  |  | $ | 89,756 |  |  | $ | 4,898 |
Licensing agreements | 38,678 |  |  | 35,947 |  |  | 2,731 |  |  | 38,678 |  |  | 34,204 |  |  | 4,474 |
Segment total | 133,332 |  |  | 127,756 |  |  | 5,576 |  |  | 133,332 |  |  | 123,960 |  |  | 9,372 |
Onshore Facilities & Transportation: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 34,731 |  |  | 699 |  |  | 35,430 |  |  | 33,676 |  |  | 1,754 |
Intangibles associated with lease | 13,260 |  |  | 4,815 |  |  | 8,445 |  |  | 13,260 |  |  | 4,459 |  |  | 8,801 |
Segment total | 48,690 |  |  | 39,546 |  |  | 9,144 |  |  | 48,690 |  |  | 38,135 |  |  | 10,555 |
Marine contract intangibles | 27,000 |  |  | 10,350 |  |  | 16,650 |  |  | 27,000 |  |  | 6,300 |  |  | 20,700 |
Offshore pipeline contract intangibles | 158,101 |  |  | 18,029 |  |  | 140,072 |  |  | 158,101 |  |  | 11,788 |  |  | 146,313 |
Other | 28,747 |  |  | 12,748 |  |  | 15,999 |  |  | 28,569 |  |  | 10,622 |  |  | 17,947 |
Total | $ | 395,870 |  |  | $ | 208,429 |  |  | $ | 187,441 |  |  | $ | 395,692 |  |  | $ | 190,805 |  |  | $ | 204,887 |
Amortization Expense | Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Amortization of intangible assets | $ | 5,879 |  |  | $ | 6,122 |  |  | $ | 17,623 |  |  | $ | 18,154 |
Schedule of Expected Amortization Expense | We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2017 | $ | 5,919 |
| 2018 | $ | 21,506 |
| 2019 | $ | 17,171 |
| 2020 | $ | 16,237 |
| 2021 | $ | 10,627 |

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