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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2022
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 PortionLong-Term PortionTotal
Balance at December 31, 2020$335 $7,289 $7,624 
Accretion(125)741 616 
Amounts paid(334)— (334)
Additions(129)(1,292)(1,421)
Reclassifications383 (383)— 
Balance at December 31, 2021130 6,355 6,485 
Accretion138 542 680 
Amounts paid(288)— (288)
Additions70 533 603 
Reclassifications193 (193)— 
Balance at December 31, 2022$243 $7,237 $7,480