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Asset Retirement Obligation (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
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, 2019
    $ 226,137  
Additions to asset retirement obligations
      421  
Accretion expense
      2,129  
Liabilities settled
      (3,742 ) 
  
 
 
  
Balance at June 30, 2020
    $ 224,945  
  
 
 
  
The following table reflects information related to our asset retirement obligations:
Balance at December 31, 2017
    $ 215,089  
Additions to asset retirement obligations
      7,583  
Accretion expense
      4,404  
Liabilities settled
      (4,087 ) 
  
 
 
  
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