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Regulatory Matters: (Tables)
 9 Months Ended
Sep. 30, 2016
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,
2016
 
December 31,
2015
GSWC
 
 
 
 
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
 
$
65,444

 
$
45,171

Costs deferred for future recovery on Aerojet case
 
12,037

 
12,699

Pensions and other post-retirement obligations (Note 7)
 
24,835

 
21,996

Derivative unrealized loss (Note 4)
 
5,581

 
7,053

Flow-through taxes, net (Note 6)
 
17,634

 
16,176

Low income rate assistance balancing accounts
 
8,378

 
8,699

Other regulatory assets
 
26,309

 
25,668

Various refunds to customers
 
(6,126
)
 
(4,766
)
Total
 
$
154,092

 
$
132,696