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Fixed Assets | 6 Months Ended
--- | ---
Jun. 30, 2016
Fixed Assets And Asset Retirement Obligations [Abstract] |
Fixed Assets | Fixed Assets 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 |
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 |
Asset Retirement Obligations We record AROs in connection with legal requirements to perform specified retirement activities under contractual arrangements and/or governmental regulations. As a result of the Enterprise acquisition of the offshore pipeline and services business of Enterprise Products Partners, L.P. on July 24, 2015, we recorded AROs based on the fair value measurement assigned during the preliminary purchase price allocation. 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 |
Of the ARO balances disclosed above, $5.5 million and 9.8 million is included as current in "Accrued liabilities" on our Unaudited Condensed Consolidated Balance Sheet as of June 30, 2016 and December 31, 2015, respectively. The remainder of the ARO liability as of June 30, 2016 and December 31, 2015 is included in "Other long-term liabilities" on our Unaudited Condensed Consolidated Balance Sheet. 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 |
Certain of our unconsolidated affiliates have AROs recorded at June 30, 2016 relating to contractual agreements and regulatory requirements. These amounts are immaterial to our Consolidated Financial Statements.

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