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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Summary of Asset Retirement Obligations
The following table reflects the details of the asset retirement obligations included in the consolidated balance sheets at December 31, 2020 and 2019:
 
    
Coal Ash Pond
  
Balance at January 1, 2019
    $ —    
Initial recognition
      2,135  
  
 
 
  
Balance at December 31, 2019
      2,135  
Accretion
      142  
  
 
 
  
Balance at December 31, 2020
    $ 2,277