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Fixed Assets, Mineral Leaseholds, and Asset Retirement Obligations
 6 Months Ended
Jun. 30, 2023
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: 
June 30, 2023December 31, 2022
Crude oil and natural gas pipelines and related assets$2,846,411 $2,844,288 
Alkali facilities, machinery and equipment731,112 701,313 
Onshore facilities, machinery and equipment270,352 269,949 
Transportation equipment23,819 22,340 
Marine vessels1,014,495 1,017,087 
Land, buildings and improvements238,521 231,651 
Office equipment, furniture and fixtures24,704 24,271 
Construction in progress(1)
868,960 712,971 
Other41,168 41,168 
Fixed assets, at cost6,059,542 5,865,038 
Less: Accumulated depreciation(1,875,840)(1,768,465)
Net fixed assets$4,183,702 $4,096,573 
(1)Construction in progress primarily relates to our Granger Optimization Project, which is expected to be completed in 2023, and our offshore growth capital projects, which are expected to be completed in 2024 and 2025.
Mineral Leaseholds
Our Mineral Leaseholds, relating to our Alkali Business, consist of the following:
June 30, 2023December 31, 2022
Mineral leaseholds$566,019 $566,019 
Less: Accumulated depletion(23,046)(20,897)
Mineral leaseholds, net of accumulated depletion$542,973 $545,122 

Our depreciation and depletion expense for the periods presented were as follows:
Three Months Ended
June 30, 		Six Months Ended
June 30,
2023202220232022
Depreciation expense$63,913 $70,033 $133,486 $135,783 
Depletion expense1,268 914 2,149 1,934 
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, 2022:
ARO liability balance, December 31, 2022
$228,573 
Accretion expense6,592 
Changes in estimate 3,915 
Settlements(60)
ARO liability balance, June 30, 2023
$239,020 
At June 30, 2023 and December 31, 2022, $26.1 million and $26.6 million are included as current in “Accrued liabilities” on our Unaudited Condensed Consolidated Balance Sheets, respectively. The remainder of the ARO liability as of June 30, 2023 and December 31, 2022 is included in “Other long-term liabilities” on our Unaudited Condensed Consolidated Balance Sheets.
Certain of our unconsolidated affiliates have AROs recorded at June 30, 2023 and December 31, 2022 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.