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Asset Retirement Obligations (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]    
Information Related to Asset Retirement Obligations
The following table reflects information related to our asset retirement obligations:
 
Balance at December 31, 2020
    $ 222,876  
Additions to asset retirement obligations
      176  
Accretion expense
      1,001  
Liabilities settled
      (1,162 ) 
    
 
 
  
Balance at March 31, 2021
    $ 222,891  
    
 
 
  
 The following table reflects information related to our asset retirement obligations:
 
Balance at December 31, 2018
    $ 222,989  
Additions to asset retirement obligations
      2,529  
Accretion expense
      4,260  
Liabilities settled
      (3,641 ) 
    
 
 
  
Balance at December 31, 2019
    $ 226,137  
Additions to asset retirement obligations
      658  
Accretion expense
      4,135  
Liabilities settled
      (8,054 ) 
    
 
 
  
Balance at December 31, 2020
    $ 222,876