Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2022

Asset Retirement Obligation Disclosure [Abstract]

Changes in Asset Retirement Obligation Liabilities

The components of the changes in the asset retirement obligation liabilities were:

(Dollars in thousands)	Short-Term Portion		Long-Term Portion		Total
Balance at December 31, 2021	$	130	$	6,355	$	6,485
Accretion	34		136		170
Amounts paid	(96)		—		(96)
Reclassifications	119		(119)		—
Balance at March 31, 2022	$	187	$	6,372	$	6,559