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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations
 3 Months Ended
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, 2021December 31, 2020
Crude oil pipelines and natural gas pipelines and related assets$2,810,931 $2,811,030 
Alkali facilities, machinery, and equipment635,446 622,598 
Onshore facilities, machinery, and equipment268,571 267,810 
Transportation equipment19,520 19,470 
Marine vessels1,002,601 998,553 
Land, buildings and improvements220,454 219,382 
Office equipment, furniture and fixtures22,096 22,001 
Construction in progress183,628 170,740 
Other43,261 41,891 
Fixed assets, at cost5,206,508 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,
20212020
Depreciation expense$62,702 $69,242 
Depletion expense912 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 expense2,584 
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 of2021$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.