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Fixed Assets and Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2015
Fixed Assets And Asset Retirement Obligations [Abstract] |
Fixed Assets and Asset Retirement Obligations | Fixed Assets and Asset Retirement Obligations Fixed Assets Fixed assets consisted of the following:
| December 31,
| 2015 |  | 2014
Crude oil pipelines and natural gas pipelines and related assets | $ | 2,501,821 |  |  | $ | 466,613 |
Machinery and equipment | 414,100 |  |  | 376,672 |
Transportation equipment | 19,025 |  |  | 18,479 |
Marine vessels | 794,508 |  |  | 731,016 |
Land, buildings and improvements | 41,202 |  |  | 38,037 |
Office equipment, furniture and fixtures | 7,540 |  |  | 6,696 |
Construction in progress | 485,575 |  |  | 222,233 |
Other | 46,455 |  |  | 39,312 |
Fixed assets, at cost | 4,310,226 |  |  | 1,899,058 |
Less: Accumulated depreciation | (378,247 | ) |  | (268,057 | )
Net fixed assets | $ | 3,931,979 |  |  | $ | 1,631,001 |
Depreciation expense was $124.2 million, $73.2 million and $46.3 million for the years ended December 31, 2015, 2014, and 2013, respectively. 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 our 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. A reconciliation of our liability for asset retirement obligations is as follows:
December 31, 2013 | $ | 14,332 |
Liabilities incurred | — |
Accretion expense | 458 |
December 31, 2014 | 14,790 |
AROs arising from our Enterprise acquisition | 158,230 |
AROs from the consolidation of historical interests in CHOPS and SEKCO | 1,988 |
Accretion expense | 4,941 |
Revisions in timing of expected settlement | 9,986 |
Settlements | (1,273 | )
December 31, 2015 | $ | 188,662 |
Of the ARO balances disclosed above, $9.8 million is included as current in "Accrued liabilities" on our Consolidated Balance Sheet, as of December 31, 2015. The remainder of the ARO liability as of December 31, 2015, as well as the ARO liability as of December 31, 2014, are included in "Other long-term liabilities" on our Consolidated Balance Sheet. With respect to our AROs, the following table presents our forecast of accretion expense for the periods indicated:
2016 | $ | 7,743 |
2017 | $ | 6,722 |
2018 | $ | 5,141 |
2019 | $ | 5,518 |
2020 | $ | 5,924 |
Certain of our unconsolidated affiliates have AROs recorded at December 31, 2015 relating to contractual agreements and regulatory requirements. These amounts are immaterial to our Consolidated Financial Statements.

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