Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2020

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 January 1, 2020	$	90	$	6,061	$	6,151
Accretion	(29)		382		353
Amounts paid	(196)		—		(196)
Reclassifications	320		(320)		—
Balance at September 30, 2020	$	185	$	6,123	$	6,308