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Intangible Assets | 3 Months Ended
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Mar. 31, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | 5. Intangible Assets The following table summarizes the components of our intangible assets at the dates indicated:
| March 31, 2013 |  | December 31, 2012
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Refinery Services: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 94,654 |  |  | $ | 70,946 |  |  | $ | 23,708 |  |  | $ | 94,654 |  |  | $ | 69,167 |  |  | $ | 25,487 |
Licensing agreements | 38,678 |  |  | 23,683 |  |  | 14,995 |  |  | 38,678 |  |  | 22,892 |  |  | 15,786 |
Supplier relationships | — |  |  | — |  |  | — |  |  | 36,469 |  |  | 36,469 |  |  | — |
Segment total | 133,332 |  |  | 94,629 |  |  | 38,703 |  |  | 169,801 |  |  | 128,528 |  |  | 41,273 |
Supply & Logistics: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 26,944 |  |  | 8,486 |  |  | 35,430 |  |  | 26,403 |  |  | 9,027 |
Intangibles associated with lease | 13,260 |  |  | 2,683 |  |  | 10,577 |  |  | 13,260 |  |  | 2,565 |  |  | 10,695 |
Trade names | — |  |  | — |  |  | — |  |  | 18,888 |  |  | 18,888 |  |  | — |
Segment total | 48,690 |  |  | 29,627 |  |  | 19,063 |  |  | 67,578 |  |  | 47,856 |  |  | 19,722 |
Other | 19,716 |  |  | 5,260 |  |  | 14,456 |  |  | 18,932 |  |  | 4,862 |  |  | 14,070 |
Total | $ | 201,738 |  |  | $ | 129,516 |  |  | $ | 72,222 |  |  | $ | 256,311 |  |  | $ | 181,246 |  |  | $ | 75,065 |
Our amortization expense for the periods presented was as follows:
| Three Months Ended March 31,
| 2013 |  | 2012
Amortization expense | $ | 3,627 |  |  | $ | 5,515 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2013 | $ | 10,929 |
| 2014 | $ | 12,422 |
| 2015 | $ | 10,614 |
| 2016 | $ | 9,152 |
| 2017 | $ | 7,989 |

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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-Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44, 45, 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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=7658586&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=7658586&loc=d3e16373-109275 Reference 4: 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=7658586&loc=d3e16265-109275 + Details
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