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Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2021
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, 2020$335 $7,289 $7,624 
Accretion(94)556 462 
Amounts paid(184)— (184)
Reclassifications395 (395)— 
Balance at September 30, 2021$452 $7,450 $7,902