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Regulatory Matters: (Tables)
 6 Months Ended
Jun. 30, 2017
Regulated Operations [Abstract]  
Schedule of regulatory assets, less regulatory liabilities in the consolidated balance sheets for continuing operations
Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows: 
(dollars in thousands)
 
June 30,
2017
 
December 31,
2016
GSWC
 
 
 
 
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
 
$
48,277

 
$
47,340

Costs deferred for future recovery on Aerojet case
 
11,470

 
11,820

Pensions and other post-retirement obligations (Note 7)
 
26,575

 
28,118

Derivative unrealized loss (Note 4)
 
4,493

 
4,901

Flow-through taxes, net (Note 6)
 
20,627

 
20,134

Low income rate assistance balancing accounts
 
8,019

 
8,272

General rate case memorandum accounts
 
13,780

 
13,929

Other regulatory assets
 
17,016

 
17,633

Various refunds to customers
 
(4,763
)
 
(5,866
)
Total
 
$
145,494

 
$
146,281