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Intangible Assets | 9 Months Ended
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Sep. 30, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | 6. Intangible Assets The following table summarizes the components of our intangible assets at the dates indicated:
| September 30, 2013 |  | December 31, 2012
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Refinery Services: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 94,654 |  |  | $ | 74,504 |  |  | $ | 20,150 |  |  | $ | 94,654 |  |  | $ | 69,167 |  |  | $ | 25,487 |
Licensing agreements | 38,678 |  |  | 25,264 |  |  | 13,414 |  |  | 38,678 |  |  | 22,892 |  |  | 15,786 |
Supplier relationships | — |  |  | — |  |  | — |  |  | 36,469 |  |  | 36,469 |  |  | — |
Segment total | 133,332 |  |  | 99,768 |  |  | 33,564 |  |  | 169,801 |  |  | 128,528 |  |  | 41,273 |
Supply & Logistics: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 28,027 |  |  | 7,403 |  |  | 35,430 |  |  | 26,403 |  |  | 9,027 |
Intangibles associated with lease | 13,260 |  |  | 2,920 |  |  | 10,340 |  |  | 13,260 |  |  | 2,565 |  |  | 10,695 |
Trade names | — |  |  | — |  |  | — |  |  | 18,888 |  |  | 18,888 |  |  | — |
Segment total | 48,690 |  |  | 30,947 |  |  | 17,743 |  |  | 67,578 |  |  | 47,856 |  |  | 19,722 |
Other | 20,512 |  |  | 6,066 |  |  | 14,446 |  |  | 18,932 |  |  | 4,862 |  |  | 14,070 |
Total | $ | 202,534 |  |  | $ | 136,781 |  |  | $ | 65,753 |  |  | $ | 256,311 |  |  | $ | 181,246 |  |  | $ | 75,065 |
Our amortization expense for the periods presented was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Amortization expense | $ | 3,656 |  |  | $ | 4,520 |  |  | $ | 10,892 |  |  | $ | 15,390 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2013 | $ | 3,655 |
| 2014 | $ | 12,500 |
| 2015 | $ | 10,692 |
| 2016 | $ | 9,230 |
| 2017 | $ | 8,067 |

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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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