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REGULATORY ASSETS (Tables)
9 Months Ended
Sep. 30, 2019
REGULATORY ASSETS [Abstract]  
Amortization Period of Other Regulatory Expense
Regulatory expenses amortized on a straight-line basis are noted below:

Expense
Years Amortized
Rate case studies
5
Debt related costs
 15 to 25 (based on term of related debt)
Goodwill (resulting from acquisition of Mountain Hill Water Company in 2008)
50
Deferred acquisition costs (resulting from purchase of water assets in Cecil County, Maryland in 2011 and Port Deposit, Maryland in 2010)
20
Franchise Costs (resulting from purchase of water assets in Cecil County, Maryland in 2011)
80

Regulatory Assets, Net of Amortization, Comprise
Regulatory assets, net of amortization, comprise:
 
  
(in thousands)
 
  
September 30, 2019
  
December 31, 2018
 
       
Postretirement benefit obligation
 
$
74
  
$
74
 
Deferred income taxes
  
389
   
401
 
Expense of rate case studies
  
30
   
46
 
Debt issuance costs
  
5,557
   
5,815
 
Goodwill
  
290
   
295
 
Deferred acquisition and franchise costs
  
593
   
623
 
  
$
6,933
  
$
7,254