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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations | 6 Months Ended
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Jun. 30, 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:
| June 30, 2021 |  | December 31, 2020
Crude oil pipelines and natural gas pipelines and related assets | $ | 2,821,996 |  |  | $ | 2,811,030 |
Alkali facilities, machinery, and equipment | 641,619 |  |  | 622,598 |
Onshore facilities, machinery, and equipment | 268,689 |  |  | 267,810 |
Transportation equipment | 21,348 |  |  | 19,470 |
Marine vessels | 1,011,171 |  |  | 998,553 |
Land, buildings and improvements | 221,146 |  |  | 219,382 |
Office equipment, furniture and fixtures | 22,185 |  |  | 22,001 |
Construction in progress | 260,742 |  |  | 170,740 |
Other | 43,261 |  |  | 41,891 |
Fixed assets, at cost | 5,312,157 |  |  | 5,173,475 |
Less: Accumulated depreciation | (1,437,510) |  |  | (1,322,141) |
Net fixed assets | $ | 3,874,647 |  |  | $ | 3,851,334 |
Mineral Leaseholds Our Mineral Leaseholds, relating to our Alkali Business, consist of the following:
| June 30, 2021 |  | December 31, 2020 |
Mineral leaseholds | $ | 566,019 |  |  | $ | 566,019 |  |
Less: Accumulated depletion | (15,060) |  |  | (13,444) |  |
Mineral leaseholds, net of accumulated depletion | $ | 550,959 |  |  | $ | 552,575 |  |
Our depreciation and depletion expense for the periods presented was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Depreciation expense | $ | 64,148 |  |  | $ | 75,089 |  |  | $ | 126,850 |  |  | $ | 144,331 |
Depletion expense | 704 |  |  | 841 |  |  | 1,616 |  |  | 1,804 |
During the second quarter of 2020, due to the challenging economic environment from the decline in commodity prices (including the collapse in the differential of Western Canadian Select to the Gulf Coast) and Covid-19, crude-by-rail transportation became uneconomic for producers and the demand and outlook for our rail logistics assets declined. As a result, we recognized impairment expense of $277.5 million associated with the rail logistics assets in our onshore facilities and transportation segment, including $272.7 million of net fixed assets and $4.8 million of right of use assets, net on the Unaudited Condensed Consolidated Balance Sheet. The fair value was calculated utilizing the income approach and assumptions were primarily based on level 3 inputs of the fair value hierarchy. 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 | 5,177 |
Changes in estimate | 97 |
Settlements | (2,824) |
ARO liability balance, June 30, 2021 | $ | 179,302 |
Of the ARO balances disclosed above, $12.3 million and $14.7 million is included as current in "Accrued liabilities" on our Unaudited Condensed Consolidated Balance Sheets as of June 30, 2021 and December 31, 2020, respectively. The remainder of the ARO liability as of June 30, 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 | $ | 4,975 |
| 2022 | $ | 9,384 |
| 2023 | $ | 9,128 |
| 2024 | $ | 9,783 |
| 2025 | $ | 10,487 |
Certain of our unconsolidated affiliates have AROs recorded at June 30, 2021 relating to contractual agreements and regulatory requirements. These amounts are immaterial to our Unaudited Condensed Consolidated Financial Statements.

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