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Intangible Assets | 6 Months Ended
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Jun. 30, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets The following table summarizes the components of our intangible assets at the dates indicated:
| June 30, 2016 |  | December 31, 2015
| Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Carrying Value
Refinery Services: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 94,654 |  |  | $ | 88,021 |  |  | $ | 6,633 |  |  | $ | 94,654 |  |  | $ | 86,285 |  |  | $ | 8,369 |
Licensing agreements | 38,678 |  |  | 32,949 |  |  | 5,729 |  |  | 38,678 |  |  | 31,694 |  |  | 6,984 |
Segment total | 133,332 |  |  | 120,970 |  |  | 12,362 |  |  | 133,332 |  |  | 117,979 |  |  | 15,353 |
Supply & Logistics: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 35,430 |  |  | 32,860 |  |  | 2,570 |  |  | 35,430 |  |  | 32,044 |  |  | 3,386 |
Intangibles associated with lease | 13,260 |  |  | 4,223 |  |  | 9,037 |  |  | 13,260 |  |  | 3,986 |  |  | 9,274 |
Segment total | 48,690 |  |  | 37,083 |  |  | 11,607 |  |  | 48,690 |  |  | 36,030 |  |  | 12,660 |
Marine contract intangibles | 27,000 |  |  | 3,600 |  |  | 23,400 |  |  | 27,000 |  |  | 900 |  |  | 26,100 |
Offshore pipeline contract intangibles | 158,101 |  |  | 7,628 |  |  | 150,473 |  |  | 158,101 |  |  | 3,467 |  |  | 154,634 |
Other | 27,678 |  |  | 9,246 |  |  | 18,432 |  |  | 22,819 |  |  | 8,120 |  |  | 14,699 |
Total | $ | 394,801 |  |  | $ | 178,527 |  |  | $ | 216,274 |  |  | $ | 389,942 |  |  | $ | 166,496 |  |  | $ | 223,446 |
Our amortization of intangible assets for the periods presented was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Amortization of intangible assets | $ | 6,040 |  |  | $ | 4,154 |  |  | $ | 12,032 |  |  | $ | 8,191 |
We estimate that our amortization expense for the next five years will be as follows:
Remainder of | 2016 | $ | 12,285 |
| 2017 | $ | 23,425 |
| 2018 | $ | 21,309 |
| 2019 | $ | 16,982 |
| 2020 | $ | 16,081 |

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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=66006027&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=66006027&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=66006027&loc=d3e16373-109275 + Details
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