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Business Segments 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting [Abstract]      
Total utility plant $ 1,296,310 $ 1,204,992 $ 1,150,926
Other assets 205,123 211,742  
Total Assets 1,501,433 1,416,734  
Parent Company      
Segment Reporting [Abstract]      
Total utility plant 0 0 0
Total Assets 659,205 593,757  
GSWC      
Segment Reporting [Abstract]      
Total utility plant 1,281,092 1,197,940  
Total Assets 1,389,222 1,326,823  
Segment Reporting Information [Line Items]      
Depreciation on transportation equipment 238 242 259
Contracted Services [Member] | American States Utility Services [Member]      
Segment Reporting [Abstract]      
Total utility plant $ 15,218 $ 7,052 $ 5,615