Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2023

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligations

The following table shows the change in our AROs (dollars in thousands):

	2023		2022
Asset retirement obligations at the beginning of year	$	797,762	$	767,382
Changes attributable to:
Accretion expense	44,269		41,240
Settlements	(14,039)		(10,860)
Estimated cash flow revisions	135,323		—
Newly incurred obligation	2,686		—
Asset retirement obligations at the end of year	$	966,001	$	797,762