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Asset Retirement Obligations - Changes in Asset Retirement Obligation Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Balance at December 31, 2022     $ 7,480  
Accretion $ 164 $ 170 328 $ 340
Amounts paid     (132)  
Reclassifications     0  
Balance at June 30, 2023 7,676   7,676  
Short-Term Portion        
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Balance at December 31, 2022     243  
Accretion     (2)  
Amounts paid     (132)  
Reclassifications     (112)  
Balance at June 30, 2023 221   221  
Long-Term Portion        
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]        
Balance at December 31, 2022     7,237  
Accretion     330  
Amounts paid     0  
Reclassifications     112  
Balance at June 30, 2023 $ 7,455   $ 7,455