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REGULATORY LIABILITIES (Tables)
9 Months Ended
Sep. 30, 2019
REGULATORY LIABILITIES [Abstract]  
Regulatory Liabilities
Regulatory liabilities comprise:
 
 
 
(in thousands)
 
 
 
September 30, 2019
  
December 31, 2018
 
 
      
Postretirement benefit obligation
 
$
52
  
$
52
 
Utility plant retirement cost obligation
  
291
   
319
 
Deferred income taxes (related to TCJA)
  
22,109
   
22,442
 
         
  
$
22,452
  
$
22,813