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Regulatory Matters: (Tables)
 3 Months Ended
Mar. 31, 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)
 
March 31,
2017
 
December 31,
2016
GSWC
 
 
 
 
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
 
$
55,298

 
$
47,340

Costs deferred for future recovery on Aerojet case
 
11,705

 
11,820

Pensions and other post-retirement obligations (Note 7)
 
27,452

 
28,118

Derivative unrealized loss (Note 4)
 
5,460

 
4,901

Flow-through taxes, net (Note 6)
 
20,708

 
20,134

Low income rate assistance balancing accounts
 
8,502

 
8,272

  General rate case memorandum accounts
 
14,689

 
13,929

Other regulatory assets
 
17,477

 
17,633

Various refunds to customers
 
(5,304
)
 
(5,866
)
Total
 
$
155,987

 
$
146,281