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Regulatory Matters: (Tables)
 3 Months Ended
Mar. 31, 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)
 
March 31,
2014
 
December 31,
2013
GSWC
 
 
 
 
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
 
$
18,077

 
$
16,345

Base Revenue Requirement Adjustment Mechanism
 
9,088

 
8,725

Costs deferred for future recovery on Aerojet case
 
14,561

 
14,763

Pensions and other post-retirement obligations (Note 6)
 
19,452

 
20,241

Flow-through taxes, net (Note 5)
 
16,938

 
16,189

Low income rate assistance balancing accounts
 
9,992

 
9,979

General rate case memorandum accounts
 
12,993

 
15,645

Other regulatory assets
 
22,124

 
25,086

Various refunds to customers
 
(3,575
)
 
(4,292
)
Total
 
$
119,650

 
$
122,681