Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2022

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change In Asset Retirement Obligations

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

	2022		2021
Asset retirement obligations at the beginning of year	$	767,382	$	705,083
Changes attributable to:
Accretion expense	41,240		38,437
Settlements	(10,860)		(4,111)
Estimated cash flow revisions	—		27,973
Asset retirement obligations at the end of year	$	797,762	$	767,382