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Intangible Assets | 6 Months Ended
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Jun. 30, 2014
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:
| June 30, 2014 |  | December 31, 2013
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Refinery Services: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 94,654 |  |  | $ | 79,082 |  |  | $ | 15,572 |  |  | $ | 94,654 |  |  | $ | 76,283 |  |  | $ | 18,371 |
Licensing agreements | 38,678 |  |  | 27,519 |  |  | 11,159 |  |  | 38,678 |  |  | 26,055 |  |  | 12,623 |
Segment total | 133,332 |  |  | 106,601 |  |  | 26,731 |  |  | 133,332 |  |  | 102,338 |  |  | 30,994 |
Supply & Logistics: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 29,398 |  |  | 6,032 |  |  | 35,430 |  |  | 28,568 |  |  | 6,862 |
Intangibles associated with lease | 13,260 |  |  | 3,275 |  |  | 9,985 |  |  | 13,260 |  |  | 3,039 |  |  | 10,221 |
Segment total | 48,690 |  |  | 32,673 |  |  | 16,017 |  |  | 48,690 |  |  | 31,607 |  |  | 17,083 |
Other | 21,714 |  |  | 7,469 |  |  | 14,245 |  |  | 21,356 |  |  | 6,505 |  |  | 14,851 |
Total | $ | 203,736 |  |  | $ | 146,743 |  |  | $ | 56,993 |  |  | $ | 203,378 |  |  | $ | 140,450 |  |  | $ | 62,928 |
Our amortization expense for the periods presented was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
Amortization expense | $ | 3,147 |  |  | $ | 3,609 |  |  | $ | 6,292 |  |  | $ | 7,236 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2014 | $ | 6,317 |
| 2015 | $ | 10,814 |
| 2016 | $ | 9,352 |
| 2017 | $ | 8,189 |
| 2018 | $ | 7,268 |

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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 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 Reference 3: 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 + Details
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