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Asset Retirement Obligations - Changes in Asset Retirement Obligation Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Balance at December 31, 2022     $ 7,480  
Accretion $ 164 $ 170 492 $ 510
Amounts paid     (172)  
Reclassifications     0  
Balance at September 30, 2023 7,800   7,800  
Short-Term Portion        
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Balance at December 31, 2022     243  
Accretion     (3)  
Amounts paid     (172)  
Reclassifications     (189)  
Balance at September 30, 2023 257   257  
Long-Term Portion        
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Balance at December 31, 2022     7,237  
Accretion     495  
Amounts paid     0  
Reclassifications     189  
Balance at September 30, 2023 $ 7,543   $ 7,543