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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations | 9 Months Ended
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Sep. 30, 2019
Fixed Assets And Asset Retirement Obligations [Abstract] |
Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations | Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations Fixed Assets Fixed assets, net consisted of the following:
| September 30, 2019 |  | December 31, 2018
Crude oil pipelines and natural gas pipelines and related assets | $ | 2,922,029 |  |  | $ | 2,918,285 |
Alkali facilities, machinery, and equipment | 563,654 |  |  | 533,924 |
Onshore facilities, machinery, and equipment | 626,492 |  |  | 639,023 |
Transportation equipment | 19,484 |  |  | 20,102 |
Marine vessels | 969,432 |  |  | 951,597 |
Land, buildings and improvements | 225,334 |  |  | 222,242 |
Office equipment, furniture and fixtures | 20,889 |  |  | 20,505 |
Construction in progress | 132,229 |  |  | 94,025 |
Other | 41,891 |  |  | 41,155 |
Fixed assets, at cost | 5,521,434 |  |  | 5,440,858 |
Less: Accumulated depreciation | (1,212,062 | ) |  | (1,023,825 | )
Net fixed assets | $ | 4,309,372 |  |  | $ | 4,417,033 |
Mineral Leaseholds Our Mineral Leaseholds, relating to our Alkali Business, consist of the following:
| September 30, 2019 |  | December 31, 2018
Mineral leaseholds | $ | 566,019 |  |  | $ | 566,019 |
Less: Accumulated depletion | (9,026 | ) |  | (5,538 | )
Mineral leaseholds, net | $ | 556,993 |  |  | $ | 560,481 |
Our depreciation and depletion expense for the periods presented was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Depreciation expense | $ | 77,228 |  |  | $ | 85,282 |  |  | $ | 222,106 |  |  | $ | 224,546 |
Depletion expense | 1,204 |  |  | 722 |  |  | 3,488 |  |  | 2,913 |
Asset Retirement Obligations We record asset retirement obligations ("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, 2018:
ARO liability balance, December 31, 2018 | $ | 239,865 |
Accretion expense | 6,825 |
Changes in estimate | (14,377 | )
Settlements | (36,028 | )
ARO liability balance, September 30, 2019 | $ | 196,285 |
Of the ARO balances disclosed above, $53.0 million and $67.5 million is included as current in "Accrued liabilities" on our Unaudited Condensed Consolidated Balance Sheet as of September 30, 2019 and December 31, 2018, respectively. The remainder of the ARO liability as of September 30, 2019 and December 31, 2018 is included in "Other long-term liabilities" on our Unaudited Condensed Consolidated Balance Sheet. During 2019, we recorded total changes in estimates of $14.4 million related to revisions in our estimated abandonment costs for certain of our non-operating offshore gas assets. With respect to our AROs, the following table presents our estimate of accretion expense for the periods indicated:
Remainder of | 2019 | $ | 2,763 |
| 2020 | $ | 8,828 |
| 2021 | $ | 8,847 |
| 2022 | $ | 9,414 |
| 2023 | $ | 10,078 |
Certain of our unconsolidated affiliates have AROs recorded at September 30, 2019 relating to contractual agreements and regulatory requirements. These amounts are immaterial to our Consolidated Financial Statements.

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