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Intangible Assets | 3 Months Ended
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Mar. 31, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | 7. Intangible Assets The following table summarizes the components of our intangible assets at the dates indicated:
| March 31, 2015 |  | December 31, 2014
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Refinery Services: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 94,654 |  |  | $ | 82,981 |  |  | $ | 11,673 |  |  | $ | 94,654 |  |  | $ | 81,880 |  |  | $ | 12,774 |
Licensing agreements | 38,678 |  |  | 29,661 |  |  | 9,017 |  |  | 38,678 |  |  | 28,983 |  |  | 9,695 |
Segment total | 133,332 |  |  | 112,642 |  |  | 20,690 |  |  | 133,332 |  |  | 110,863 |  |  | 22,469 |
Supply & Logistics: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 30,601 |  |  | 4,829 |  |  | 35,430 |  |  | 30,228 |  |  | 5,202 |
Intangibles associated with lease | 13,260 |  |  | 3,631 |  |  | 9,629 |  |  | 13,260 |  |  | 3,512 |  |  | 9,748 |
Segment total | 48,690 |  |  | 34,232 |  |  | 14,458 |  |  | 48,690 |  |  | 33,740 |  |  | 14,950 |
Marine contract intangibles | 32,000 |  |  | 2,083 |  |  | 29,917 |  |  | 32,000 |  |  | 833 |  |  | 31,167 |
Other | 23,821 |  |  | 8,968 |  |  | 14,853 |  |  | 22,797 |  |  | 8,452 |  |  | 14,345 |
Total | $ | 237,843 |  |  | $ | 157,925 |  |  | $ | 79,918 |  |  | $ | 236,819 |  |  | $ | 153,888 |  |  | $ | 82,931 |
Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended March 31,
| 2015 |  | 2014
Amortization of intangible assets | $ | 4,037 |  |  | $ | 3,145 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2015 | $ | 13,922 |
| 2016 | $ | 15,613 |
| 2017 | $ | 14,450 |
| 2018 | $ | 12,334 |
| 2019 | $ | 8,021 |

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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 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 2: 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 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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