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Intangible Assets | 9 Months Ended
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Sep. 30, 2016
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, 2016 |  | December 31, 2015
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Refinery Services: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 94,654 |  |  | $ | 88,888 |  |  | $ | 5,766 |  |  | $ | 94,654 |  |  | $ | 86,285 |  |  | $ | 8,369 |
Licensing agreements | 38,678 |  |  | 33,577 |  |  | 5,101 |  |  | 38,678 |  |  | 31,694 |  |  | 6,984 |
Segment total | 133,332 |  |  | 122,465 |  |  | 10,867 |  |  | 133,332 |  |  | 117,979 |  |  | 15,353 |
Supply & Logistics: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 33,268 |  |  | 2,162 |  |  | 35,430 |  |  | 32,044 |  |  | 3,386 |
Intangibles associated with lease | 13,260 |  |  | 4,341 |  |  | 8,919 |  |  | 13,260 |  |  | 3,986 |  |  | 9,274 |
Segment total | 48,690 |  |  | 37,609 |  |  | 11,081 |  |  | 48,690 |  |  | 36,030 |  |  | 12,660 |
Marine contract intangibles | 27,000 |  |  | 4,950 |  |  | 22,050 |  |  | 27,000 |  |  | 900 |  |  | 26,100 |
Offshore pipeline contract intangibles | 158,101 |  |  | 9,708 |  |  | 148,393 |  |  | 158,101 |  |  | 3,467 |  |  | 154,634 |
Other | 28,240 |  |  | 9,918 |  |  | 18,322 |  |  | 22,819 |  |  | 8,120 |  |  | 14,699 |
Total | $ | 395,363 |  |  | $ | 184,650 |  |  | $ | 210,713 |  |  | $ | 389,942 |  |  | $ | 166,496 |  |  | $ | 223,446 |
Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Amortization of intangible assets | $ | 6,122 |  |  | $ | 5,554 |  |  | $ | 18,154 |  |  | $ | 13,745 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2016 | $ | 6,169 |
| 2017 | $ | 23,532 |
| 2018 | $ | 21,361 |
| 2019 | $ | 17,026 |
| 2020 | $ | 16,125 |

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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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