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Intangible Assets | 3 Months Ended
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Mar. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets The following table summarizes the components of our intangible assets at the dates indicated:
| March 31, 2017 |  | December 31, 2016
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Refinery Services: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 94,654 |  |  | $ | 90,441 |  |  | $ | 4,213 |  |  | $ | 94,654 |  |  | $ | 89,756 |  |  | $ | 4,898 |
Licensing agreements | 38,678 |  |  | 34,785 |  |  | 3,893 |  |  | 38,678 |  |  | 34,204 |  |  | 4,474 |
Segment total | 133,332 |  |  | 125,226 |  |  | 8,106 |  |  | 133,332 |  |  | 123,960 |  |  | 9,372 |
Supply & Logistics: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 34,027 |  |  | 1,403 |  |  | 35,430 |  |  | 33,676 |  |  | 1,754 |
Intangibles associated with lease | 13,260 |  |  | 4,578 |  |  | 8,682 |  |  | 13,260 |  |  | 4,459 |  |  | 8,801 |
Segment total | 48,690 |  |  | 38,605 |  |  | 10,085 |  |  | 48,690 |  |  | 38,135 |  |  | 10,555 |
Marine contract intangibles | 27,000 |  |  | 7,650 |  |  | 19,350 |  |  | 27,000 |  |  | 6,300 |  |  | 20,700 |
Offshore pipeline contract intangibles | 158,101 |  |  | 13,868 |  |  | 144,233 |  |  | 158,101 |  |  | 11,788 |  |  | 146,313 |
Other | 28,703 |  |  | 11,328 |  |  | 17,375 |  |  | 28,569 |  |  | 10,622 |  |  | 17,947 |
Total | $ | 395,826 |  |  | $ | 196,677 |  |  | $ | 199,149 |  |  | $ | 395,692 |  |  | $ | 190,805 |  |  | $ | 204,887 |
Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended March 31,
| 2017 |  | 2016
Amortization of intangible assets | $ | 5,872 |  |  | $ | 5,992 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2017 | $ | 17,733 |
| 2018 | $ | 21,502 |
| 2019 | $ | 17,167 |
| 2020 | $ | 16,249 |
| 2021 | $ | 10,622 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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- References No definition available. + Details
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