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Asset Retirement Obligations ("ARO") (Tables)
12 Months Ended
Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Summary of changes in ARO
The following table summarizes changes in the Company’s ARO (dollars in thousands):
December 31, 2021December 31, 2020
Balance, beginning of period$4,785 $4,374 
Accretion expense408 374 
Changes in estimates— 37 
Balance, end of period$5,193 $4,785