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Fixed Assets and Mineral Leaseholds (Tables) | 6 Months Ended
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Jun. 30, 2018
Fixed Assets And Asset Retirement Obligations [Abstract] |
Schedule of 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 |
Schedule of 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 |
Schedule of Depreciation and Depletion Expense | 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 |  |  | — |
Schedule of Change in Asset Retirement Obligation | 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 |
Schedule of Forecast of Accretion Expense of Asset Retirement Obligations | 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 |

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