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REGULATORY LIABILITIES (Tables)
9 Months Ended
Sep. 30, 2018
REGULATORY LIABILITIES [Abstract]  
Regulatory Liabilities
Regulatory liabilities comprise:
 
 
 
(in thousands)
 
 
 
September 30, 2018
  
December 31, 2017
 
 
      
Postretirement benefit obligation
 
$
112
  
$
112
 
Utility plant retirement cost obligation
  
461
   
549
 
Deferred income taxes (related to TCJA)
  
23,354
   
22,540
 
         
  
$
23,927
  
$
23,201