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Asset Retirement Obligations - Schedule of Change in Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Change in asset retirement obligations    
Asset retirement obligations at the beginning of year $ 1,146,586 $ 966,001
Changes attributable to:    
Accretion expense 64,552 56,143
Settlements (16,570) (18,379)
Estimated cash flow revisions 61,080 142,821
Newly incurred obligation 14,651 0
Asset retirement obligations at the end of year $ 1,270,299 $ 1,146,586