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Regulatory Matters: (Tables)
 6 Months Ended
Jun. 30, 2013
Regulated Operations [Abstract]  
Schedule of regulatory assets, less regulatory liabilities in the consolidated balance sheets for continuing operations
If the CPUC determined that a portion of GSWC’s assets were not recoverable in customer rates, GSWC would be required to determine if it had suffered an asset impairment that would require a write-down in the assets’ valuation. Regulatory assets, less regulatory liabilities, included in the consolidated balance sheets are as follows:
 
(dollars in thousands)
 
June 30,
2013
 
December 31,
2012
GSWC
 
 
 
 
Water Revenue Adjustment Mechanism, net of Modified Cost Balancing Account
 
$
38,003

 
$
42,574

Base Revenue Requirement Adjustment Mechanism
 
8,265

 
6,833

Costs deferred for future recovery on Aerojet case
 
15,577

 
16,030

Pensions and other post-retirement obligations (Note 7)
 
55,836

 
56,894

Flow-through taxes, net (Note 6)
 
15,340

 
16,415

General rate case memorandum accounts
 
17,239

 
4,495

Other regulatory assets
 
40,393

 
40,332

Various refunds to customers
 
(5,760
)
 
(7,558
)
Total
 
$
184,893

 
$
176,015