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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Regulatory matters:    
Regulatory Asset Not Accruing Carrying Costs $ 48,900  
Pension Costs and Other Postretirement Benefit Costs [Member]    
Regulatory matters:    
Regulatory Asset Not Accruing Carrying Costs 19,800  
GSWC    
Regulatory matters:    
Total 132,696 $ 125,704
GSWC | Various refunds to customers    
Regulatory matters:    
Total (4,766) (1,800)
GSWC | WRAM, net of MCBA    
Regulatory matters:    
Total 45,171 9,369
GSWC | Base revenue requirement adjustment mechanism    
Regulatory matters:    
Total 3,714 7,761
GSWC | Costs deferred for future recovery on Aerojet case    
Regulatory matters:    
Total 12,699 13,629
GSWC | Pension Costs and Other Postretirement Benefit Costs [Member]    
Regulatory matters:    
Total 21,996 43,426
GSWC | Gain (Loss) on Derivative Instruments [Member]    
Regulatory matters:    
Total 7,053 3,339
GSWC | Flow-through taxes, net    
Regulatory matters:    
Total 16,176 17,612
GSWC | Low income rate assistance balancing accounts    
Regulatory matters:    
Total 8,699 9,109
GSWC | Other regulatory assets, net    
Regulatory matters:    
Total $ 21,954 $ 23,259