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Fixed Assets and Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2025
Fixed Assets And Asset Retirement Obligations [Abstract]  
Fixed Assets and Asset Retirement Obligations Fixed Assets and Asset Retirement Obligations
Fixed Assets
Fixed assets consisted of the following: 
September 30, 2025December 31, 2024
Crude oil and natural gas pipelines and related assets$3,825,345 $3,367,908 
Onshore facilities, machinery and equipment291,797 293,436 
Transportation equipment24,185 22,976 
Marine vessels1,064,148 1,062,720 
Land, buildings and improvements88,579 88,545 
Office equipment, furniture and fixtures10,441 10,101 
Construction in progress27,463 408,509 
Other26,665 26,665 
Fixed assets, at cost5,358,623 5,280,860 
Less: Accumulated depreciation(1,858,430)(1,740,974)
Net fixed assets$3,500,193 $3,539,886 
Our depreciation expense for the periods presented was as follows:
Three Months Ended
September 30, 		Nine Months Ended
September 30,
2025202420252024
Depreciation expense$54,486 $52,643 $161,433 $148,290 
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, 2024:
ARO liability balance, December 31, 2024
$254,054 
Accretion expense8,624 
Revisions in timing and estimated costs of AROs(705)
Liabilities incurred954 
Settlements(2,132)
ARO liability balance, September 30, 2025
$260,795 
At September 30, 2025 and December 31, 2024, $25.8 million is included as current in “Accrued liabilities” on our Unaudited Condensed Consolidated Balance Sheets. The remainder of the ARO liability as of September 30, 2025 and December 31, 2024 is included in “Other long-term liabilities” on our Unaudited Condensed Consolidated Balance Sheets.
Certain of our unconsolidated affiliates have AROs recorded at September 30, 2025 and December 31, 2024 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. These amounts are immaterial to our Unaudited Condensed Consolidated Financial Statements.