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Regulatory Matters 9 (Details) - GSWC
renewable_energy in Thousands, $ in Thousands
 1 Months Ended
Dec. 31, 2012
renewable_energy
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Regulatory matters:      
Net regulatory assets | $   $ (28,340) $ 2,042
Renewables Portfolio Standard [Member]      
Regulatory matters:      
Agreement period to purchase renewable energy credits 10 years    
Number of renewable energy credits that would be purchased | renewable_energy 578