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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations | 3 Months Ended
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Mar. 31, 2021
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:
| March 31, 2021 |  | December 31, 2020
Crude oil pipelines and natural gas pipelines and related assets | $ | 2,810,931 |  |  | $ | 2,811,030 |
Alkali facilities, machinery, and equipment | 635,446 |  |  | 622,598 |
Onshore facilities, machinery, and equipment | 268,571 |  |  | 267,810 |
Transportation equipment | 19,520 |  |  | 19,470 |
Marine vessels | 1,002,601 |  |  | 998,553 |
Land, buildings and improvements | 220,454 |  |  | 219,382 |
Office equipment, furniture and fixtures | 22,096 |  |  | 22,001 |
Construction in progress | 183,628 |  |  | 170,740 |
Other | 43,261 |  |  | 41,891 |
Fixed assets, at cost | 5,206,508 |  |  | 5,173,475 |
Less: Accumulated depreciation | (1,381,384) |  |  | (1,322,141) |
Net fixed assets | $ | 3,825,124 |  |  | $ | 3,851,334 |
Mineral Leaseholds Our Mineral Leaseholds, relating to our Alkali Business, consist of the following:
| March 31, 2021 |  | December 31, 2020 |
Mineral leaseholds | $ | 566,019 |  |  | $ | 566,019 |  |
Less: Accumulated depletion | (14,356) |  |  | (13,444) |  |
Mineral leaseholds, net of accumulated depletion | $ | 551,663 |  |  | $ | 552,575 |  |
Our depreciation and depletion expense for the periods presented was as follows:
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
Depreciation expense |  |  |  |  | $ | 62,702 |  |  | $ | 69,242 |
Depletion expense |  |  |  |  | 912 |  |  | 963 |
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, 2020:
ARO liability balance, December 31, 2020 | $ | 176,852 |
Accretion expense | 2,584 |
Changes in estimate | 797 |
Settlements | (2,017) |
ARO liability balance, March 31, 2021 | $ | 178,216 |
Of the ARO balances disclosed above, $13.6 million and $14.7 million is included as current in "Accrued liabilities" on our Unaudited Condensed Consolidated Balance Sheet as of March 31, 2021 and December 31, 2020, respectively. The remainder of the ARO liability as of March 31, 2021 and December 31, 2020 is included in "Other long-term liabilities" on our Unaudited Condensed Consolidated Balance Sheets. With respect to our AROs, the following table presents our estimate of accretion expense for the periods indicated:
Remainder of | 2021 | $ | 7,532 |
| 2022 | $ | 9,384 |
| 2023 | $ | 9,128 |
| 2024 | $ | 9,783 |
| 2025 | $ | 10,487 |
Certain of our unconsolidated affiliates have AROs recorded at March 31, 2021 relating to contractual agreements and regulatory requirements. These amounts are immaterial to our Unaudited Condensed Consolidated Financial Statements.

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