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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2022
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 consisted of the following:
 
September 30, 2022December 31, 2021
Crude oil and natural gas pipelines and related assets$2,840,829 $2,839,443 
Alkali facilities, machinery and equipment688,569 670,880 
Onshore facilities, machinery and equipment269,249 269,245 
Transportation equipment22,032 21,106 
Marine vessels1,013,713 1,018,284 
Land, buildings and improvements229,202 227,540 
Office equipment, furniture and fixtures27,066 23,965 
Construction in progress599,802 350,137 
Other41,168 43,440 
Fixed assets, at cost5,731,630 5,464,040 
Less: Accumulated depreciation(1,711,306)(1,551,855)
Net fixed assets$4,020,324 $3,912,185 
Mineral Leaseholds
Our Mineral Leaseholds, relating to our Alkali Business, consist of the following:
September 30, 2022December 31, 2021
Mineral leaseholds$566,019 $566,019 
Less: Accumulated depletion(19,844)(17,014)
Mineral leaseholds, net of accumulated depletion$546,175 $549,005 

Our depreciation and depletion expense for the periods presented was as follows:
Three Months Ended
September 30, 		Nine Months Ended
September 30,
2022202120222021
Depreciation expense$70,328 $63,482 $206,111 $190,332 
Depletion expense896 959 2,830 2,575 
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, 2021:
ARO liability balance, December 31, 2021$220,906 
Accretion expense10,175 
Changes in estimate 3,189 
Settlements(12,267)
ARO liability balance, September 30, 2022$222,003 
At September 30, 2022 and December 31, 2021, $28.8 million and $36.3 million are included as current in “Accrued liabilities” on our Unaudited Condensed Consolidated Balance Sheets, respectively. The remainder of the ARO liability as of September 30, 2022 and December 31, 2021 is included in “Other long-term liabilities” on our Unaudited Condensed Consolidated Balance Sheets.
With respect to our AROs, the following table presents our forecast of accretion expense for the periods indicated:
Remainder of2022$2,909 
2023$10,640 
2024$9,827 
2025$10,532 
2026$8,281 
Certain of our unconsolidated affiliates have AROs recorded at September 30, 2022 and December 31, 2021 relating to contractual agreements and regulatory requirements. In addition, certain entities that we consolidate have non-controlling interest owners that are responsible for their representative share of future costs of the related ARO liability. These amounts are immaterial to our Unaudited Condensed Consolidated Financial Statements.