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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2015
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:
 
 
December 31,
(dollars in thousands)
 
2015
 
2014
GSWC
 
 

 
 

Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
 
$
45,171

 
$
9,369

Base Revenue Requirement Adjustment Mechanism
 
3,714

 
7,761

Costs deferred for future recovery on Aerojet case
 
12,699

 
13,629

Pensions and other post-retirement obligations (Note 11)
 
21,996

 
43,426

Derivative unrealized loss (Note 4)
 
7,053

 
3,339

Flow-through taxes, net (Note 10)
 
16,176

 
17,612

Low income rate assistance balancing accounts
 
8,699

 
9,109

Other regulatory assets
 
21,954

 
23,259

Various refunds to customers
 
(4,766
)
 
(1,800
)
Total
 
$
132,696

 
$
125,704