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Fixed Assets | 6 Months Ended
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Jun. 30, 2017
Fixed Assets And Asset Retirement Obligations [Abstract] |
Fixed Assets | Fixed Assets Fixed Assets Fixed assets consisted of the following:
| June 30, 2017 |  | December 31, 2016
Crude oil pipelines and natural gas pipelines and related assets | $ | 2,984,884 |  |  | $ | 2,901,202 |
Onshore facilities, machinery, and equipment | 762,610 |  |  | 427,658 |
Transportation equipment | 17,857 |  |  | 17,543 |
Marine vessels | 866,584 |  |  | 863,199 |
Land, buildings and improvements | 102,841 |  |  | 55,712 |
Office equipment, furniture and fixtures | 9,681 |  |  | 9,654 |
Construction in progress | 42,882 |  |  | 440,225 |
Other | 55,668 |  |  | 48,203 |
Fixed assets, at cost | 4,843,007 |  |  | 4,763,396 |
Less: Accumulated depreciation | (629,193 | ) |  | (548,532 | )
Net fixed assets | $ | 4,213,814 |  |  | $ | 4,214,864 |
Our depreciation expense for the periods presented was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Depreciation expense | $ | 50,397 |  |  | $ | 48,807 |  |  | $ | 100,321 |  |  | $ | 88,519 |
During the period ending June 30, 2017, we sold certain non-core natural gas gathering and platform assets in the Gulf of Mexico that resulted in a gain of $26.7 million. Asset Retirement Obligations We record AROs in connection with legal requirements to perform specified retirement activities under contractual arrangements and/or governmental regulations. The following table presents information regarding our AROs since December 31, 2016:
ARO liability balance, December 31, 2016 | $ | 213,726 |
Accretion expense | 5,581 |
Change in estimate | 729 |
Divestitures | (7,649 | )
Settlements | (12,553 | )
Other | 240 |
ARO liability balance, June 30, 2017 | $ | 200,074 |
Of the ARO balances disclosed above, $20.1 million and $22.4 million is included as current in "Accrued liabilities" on our Unaudited Condensed Consolidated Balance Sheet as of June 30, 2017 and December 31, 2016, respectively. The remainder of the ARO liability as of June 30, 2017 and December 31, 2016 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 | 2017 | $ | 5,553 |
| 2018 | $ | 9,393 |
| 2019 | $ | 8,627 |
| 2020 | $ | 9,209 |
| 2021 | $ | 9,830 |
Certain of our unconsolidated affiliates have AROs recorded at June 30, 2017 relating to contractual agreements and regulatory requirements. These amounts are immaterial to our Consolidated Financial Statements.

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