Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2023

Asset Retirement Obligation Disclosure [Abstract]

Change in asset retirement obligations

The following schedule shows the change in our asset retirement obligations for the six months ended June 30, 2023 (dollars in thousands): 

	2023
Asset retirement obligations at January 1, 2023	$	797,762
Changes attributable to:
Accretion expense	21,313
Settlements	(2,868)
Estimated cash flow revisions	22,912
Asset retirement obligations at June 30, 2023	$	839,119