Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2024

Asset Retirement Obligation Disclosure [Abstract]

Summary of Changes in Asset Retirement Obligation Liability Balances

The components of the changes in the asset retirement obligation liabilities for the periods stated were as follows:

(Dollars in thousands)	Short-Term Portion		Long-Term Portion		Total
Balance as of December 31, 2022	$	243	$	7,237	$	7,480
Accretion	(4)		660		656
Amounts paid	(243)		—		(243)
Reductions	(33)		(463)		(496)
Reclassifications	243		(243)		—
Balance as of December 31, 2023	206		7,191		7,397
Accretion	589		108		697
Amounts paid	(462)		—		(462)
Reductions	287		(1,425)		(1,138)
Reclassifications	(71)		71		—
Balance as of December 31, 2024	$	549	$	5,945	$	6,494