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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations | 6 Months Ended
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Jun. 30, 2020
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, 2020 |  | December 31, 2019
Crude oil pipelines and natural gas pipelines and related assets | $ | 2,883,553 |  |  | $ | 2,891,489 |
Alkali facilities, machinery, and equipment | 600,325 |  |  | 591,547 |
Onshore facilities, machinery, and equipment | 264,208 |  |  | 640,376 |
Transportation equipment | 18,728 |  |  | 19,864 |
Marine vessels | 991,623 |  |  | 979,171 |
Land, buildings and improvements | 217,719 |  |  | 238,451 |
Office equipment, furniture and fixtures | 22,001 |  |  | 22,645 |
Construction in progress | 148,865 |  |  | 115,162 |
Other | 41,891 |  |  | 41,891 |
Fixed assets, at cost | 5,188,913 |  |  | 5,540,596 |
Less: Accumulated depreciation | (1,238,006) |  |  | (1,246,121) |
Net fixed assets | $ | 3,950,907 |  |  | $ | 4,294,475 |
Mineral Leaseholds Our Mineral Leaseholds, relating to our Alkali Business, consist of the following:
| June 30, 2020 |  | December 31, 2019 |
Mineral leaseholds | $ | 566,019 |  |  | $ | 566,019 |  |
Less: Accumulated depletion | (11,998) |  |  | (10,194) |  |
Mineral leaseholds, net of accumulated depletion | $ | 554,021 |  |  | $ | 555,825 |  |
Our depreciation and depletion expense for the periods presented was as follows:
| Three Months Ended June 30, |  |  |  | Six Months Ended June 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Depreciation expense | $ | 75,089 |  |  | $ | 73,206 |  |  | $ | 144,331 |  |  | $ | 144,878 |
Depletion expense | 841 |  |  | 965 |  |  | 1,804 |  |  | 2,284 |
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 has become uneconomic for producers and the current demand and outlook for our rail logistics assets has declined. Due to this, we identified a triggering event that required us to perform an impairment test. For our recoverability test, we utilized management's estimates, including current contractual commitments, for our future cash inflows, and our costs and expenses were determined based on the estimated fixed and variable requirements to operate and maintain the related assets. As our rail logistics asset groups did not pass the initial recoverability assessment, we subsequently performed a fair value calculation using a discounted cash flow model under the income approach. As a result of this test, we recognized impairment expense of $277.5 million associated with the rail logistics assets in our onshore facilities and transportation segment, as the carrying value of our assets exceeded the estimated realizable value, 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 estimates used in the long-lived asset test 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, 2019:
ARO liability balance, December 31, 2019 | $ | 175,081 |
Accretion expense | 4,510 |
Changes in estimate | 560 |
Settlements | (9,851) |
ARO liability balance, June 30, 2020 | $ | 170,300 |
Of the ARO balances disclosed above, $11.6 million and $26.6 million is included as current in "Accrued liabilities" on our Unaudited Condensed Consolidated Balance Sheet as of June 30, 2020 and December 31, 2019, respectively. The remainder of the ARO liability as of June 30, 2020 and December 31, 2019 is included in "Other long-term liabilities" on our Unaudited Condensed Consolidated Balance Sheet. With respect to our AROs, the following table presents our estimate of accretion expense for the periods indicated:
Remainder of | 2020 | $ | 4,868 |
| 2021 | $ | 9,497 |
| 2022 | $ | 9,513 |
| 2023 | $ | 10,183 |
| 2024 | $ | 10,900 |
Certain of our unconsolidated affiliates have AROs recorded at June 30, 2020 relating to contractual agreements and regulatory requirements. These amounts are immaterial to our Unaudited Condensed Consolidated Financial Statements.

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