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Fixed Assets and Mineral Leaseholds | 6 Months Ended
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Jun. 30, 2018
Fixed Assets And Asset Retirement Obligations [Abstract] |
Fixed Assets and Mineral Leaseholds | Fixed Assets and Mineral Leaseholds Fixed Assets Fixed assets consisted of the following:
| June 30, 2018 |  | December 31, 2017
Crude oil pipelines and natural gas pipelines and related assets | $ | 3,090,475 |  |  | $ | 3,028,657 |
Alkali facilities, machinery, and equipment | 506,924 |  |  | 497,601 |
Onshore facilities, machinery, and equipment | 725,624 |  |  | 692,364 |
Transportation equipment | 21,529 |  |  | 21,483 |
Marine vessels | 935,823 |  |  | 918,953 |
Land, buildings and improvements | 230,665 |  |  | 223,186 |
Office equipment, furniture and fixtures | 18,924 |  |  | 18,112 |
Construction in progress | 104,592 |  |  | 151,768 |
Other | 51,597 |  |  | 48,891 |
Fixed assets, at cost | 5,686,153 |  |  | 5,601,015 |
Less: Accumulated depreciation | (867,465 | ) |  | (734,986 | )
Net fixed assets | $ | 4,818,688 |  |  | $ | 4,866,029 |
Mineral Leaseholds Our Mineral Leaseholds, relating to our recently acquired Alkali Business, consist of the following:
| June 30, 2018 |  | December 31, 2017
Mineral leaseholds | $ | 566,019 |  |  | $ | 566,019 |
Less: Accumulated depletion | (3,704 | ) |  | (1,513 | )
Mineral leaseholds, net | $ | 562,315 |  |  | $ | 564,506 |
Our depreciation and depletion expense for the periods presented was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Depreciation expense | $ | 70,836 |  |  | $ | 50,397 |  |  | $ | 139,264 |  |  | $ | 100,321 |
Depletion expense | 1,054 |  |  | — |  |  | 2,191 |  |  | — |
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, 2017:
ARO liability balance, December 31, 2017 | $ | 198,187 |
Accretion expense | 5,496 |
Change in estimate | 513 |
Settlements | (6,223 | )
ARO liability balance, June 30, 2018 | $ | 197,973 |
Of the ARO balances disclosed above, $9.6 million and $20.9 million is included as current in "Accrued liabilities" on our Unaudited Condensed Consolidated Balance Sheet as of June 30, 2018 and December 31, 2017, respectively. The remainder of the ARO liability as of June 30, 2018 and December 31, 2017 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 | 2018 | $ | 5,432 |
| 2019 | $ | 9,877 |
| 2020 | $ | 8,710 |
| 2021 | $ | 9,302 |
| 2022 | $ | 9,935 |
Certain of our unconsolidated affiliates have AROs recorded at June 30, 2018 relating to contractual agreements and regulatory requirements. These amounts are immaterial to our Consolidated Financial Statements.

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