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Fixed Assets (Tables) | 6 Months Ended
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Jun. 30, 2016
Fixed Assets And Asset Retirement Obligations [Abstract] |
Schedule Of Fixed Assets | Fixed assets consisted of the following:
| June 30, 2016 |  | December 31, 2015
Crude oil pipelines and natural gas pipelines and related assets | $ | 2,657,642 |  |  | $ | 2,501,821 |
Machinery and equipment | 418,013 |  |  | 414,100 |
Transportation equipment | 18,991 |  |  | 19,025 |
Marine vessels | 821,895 |  |  | 794,508 |
Land, buildings and improvements | 49,431 |  |  | 41,202 |
Office equipment, furniture and fixtures | 9,347 |  |  | 7,540 |
Construction in progress | 566,804 |  |  | 485,575 |
Other | 46,915 |  |  | 46,455 |
Fixed assets, at cost | 4,589,038 |  |  | 4,310,226 |
Less: Accumulated depreciation | (463,244 | ) |  | (378,247 | )
Net fixed assets | $ | 4,125,794 |  |  | $ | 3,931,979 |
Depreciation Expense | Our depreciation expense for the periods presented was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Depreciation expense | $ | 48,807 |  |  | $ | 22,512 |  |  | $ | 88,519 |  |  | $ | 44,549 |
Schedule of Change in Asset Retirement Obligation | The following table presents information regarding our AROs since December 31, 2015:
ARO liability balance, December 31, 2015 | $ | 188,662 |
AROs arising from the purchase of the remaining interest in Deepwater Gateway | 10,470 |
AROs from the consolidation of historical interest in Deepwater Gateway | 10,470 |
Accretion expense | 5,079 |
Change in estimate | 4,590 |
Settlements | (2,071 | )
ARO liability balance, June 30, 2016 | $ | 217,200 |
Schedule of Asset Retirement Obligations | With respect to our AROs, the following table presents our forecast of accretion expense for the periods indicated:
Remainder of | 2016 | $ | 5,473 |
| 2017 | $ | 9,900 |
| 2018 | $ | 8,204 |
| 2019 | $ | 8,731 |
| 2020 | $ | 9,293 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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