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Regulatory Matters: (Tables)
 9 Months Ended
Sep. 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)
 
September 30,
2017
 
December 31,
2016
GSWC
 
 
 
 
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
 
$
40,230

 
$
47,340

Costs deferred for future recovery on Aerojet case
 
10,983

 
11,820

Pensions and other post-retirement obligations (Note 7)
 
24,944

 
28,118

Derivative unrealized loss (Note 4)
 
3,837

 
4,901

Flow-through taxes, net (Note 6)
 
21,231

 
20,134

Low income rate assistance balancing accounts
 
6,779

 
8,272

General rate case memorandum accounts
 
12,369

 
13,929

Other regulatory assets
 
15,322

 
17,633

Various refunds to customers
 
(4,789
)
 
(5,866
)
Total
 
$
130,906

 
$
146,281