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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Asset Retirement Obligation    
Beginning balance $ 7,624 $ 6,151
Accretion 616 471
Amounts paid (334) (352)
Additions (1,421) 1,354
Reclassifications 0 0
Ending balance 6,485 7,624
Total estimated liability 7,800  
Short-Term Portion    
Asset Retirement Obligation    
Beginning balance 335 90
Accretion (125) (38)
Amounts paid (334) (352)
Additions (129) 169
Reclassifications 383 466
Ending balance 130 335
Long-Term Portion    
Asset Retirement Obligation    
Beginning balance 7,289 6,061
Accretion 741 509
Amounts paid 0 0
Additions (1,292) 1,185
Reclassifications (383) (466)
Ending balance $ 6,355 $ 7,289