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Regulatory Matters: (Tables)
 9 Months Ended
Sep. 30, 2014
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,
2014
 
December 31,
2013
GSWC
 
 
 
 
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
 
$
13,987

 
$
16,345

Base Revenue Requirement Adjustment Mechanism
 
10,121

 
8,725

Costs deferred for future recovery on Aerojet case
 
13,906

 
14,763

Pensions and other post-retirement obligations (Note 6)
 
18,142

 
20,241

Flow-through taxes, net (Note 5)
 
16,203

 
16,189

Low income rate assistance balancing accounts
 
9,218

 
9,979

General rate case memorandum accounts
 
6,171

 
15,645

Other regulatory assets
 
18,216

 
25,086

Various refunds to customers
 
(2,348
)
 
(4,292
)
Total
 
$
103,616

 
$
122,681