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Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Beginning balance $ 4,453 $ 0
Ending balance 4,453 4,453
American Electric    
Goodwill [Roll Forward]    
Acquisition 0 139
Diversenergy, LLC    
Goodwill [Roll Forward]    
Acquisition $ 0 $ 4,314