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Intangible Assets | 9 Months Ended
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Sep. 30, 2015
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, 2015 |  | December 31, 2014
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Refinery Services: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 94,654 |  |  | $ | 85,184 |  |  | $ | 9,470 |  |  | $ | 94,654 |  |  | $ | 81,880 |  |  | $ | 12,774 |
Licensing agreements | 38,678 |  |  | 31,016 |  |  | 7,662 |  |  | 38,678 |  |  | 28,983 |  |  | 9,695 |
Segment total | 133,332 |  |  | 116,200 |  |  | 17,132 |  |  | 133,332 |  |  | 110,863 |  |  | 22,469 |
Supply & Logistics: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 31,563 |  |  | 3,867 |  |  | 35,430 |  |  | 30,228 |  |  | 5,202 |
Intangibles associated with lease | 13,260 |  |  | 3,868 |  |  | 9,392 |  |  | 13,260 |  |  | 3,512 |  |  | 9,748 |
Segment total | 48,690 |  |  | 35,431 |  |  | 13,259 |  |  | 48,690 |  |  | 33,740 |  |  | 14,950 |
Marine contract intangibles | 32,000 |  |  | 4,583 |  |  | 27,417 |  |  | 32,000 |  |  | 833 |  |  | 31,167 |
Offshore pipeline contract intangibles | 158,831 |  |  | 1,393 |  |  | 157,438 |  |  | — |  |  | — |  |  | — |
Other | 21,798 |  |  | 7,587 |  |  | 14,211 |  |  | 22,797 |  |  | 8,452 |  |  | 14,345 |
Total | $ | 394,651 |  |  | $ | 165,194 |  |  | $ | 229,457 |  |  | $ | 236,819 |  |  | $ | 153,888 |  |  | $ | 82,931 |
Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Amortization of intangible assets | $ | 5,554 |  |  | $ | 3,148 |  |  | $ | 13,745 |  |  | $ | 9,440 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2015 | $ | 6,785 |
| 2016 | $ | 24,014 |
| 2017 | $ | 22,850 |
| 2018 | $ | 20,735 |
| 2019 | $ | 16,422 |

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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=26713463&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=26713463&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=26713463&loc=d3e16373-109275 + Details
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