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Business Segments: (Details 2) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Details of reportable segment      
Total utility plant $ 1,649,859 $ 1,542,423 $ 1,626,004
Other assets 264,073 250,398  
Total Assets 1,913,932 1,792,821 1,900,983
GSWC      
Details of reportable segment      
Total utility plant 1,523,665   1,499,745
Total Assets 1,650,721   $ 1,638,482
Golden State Water Company and Bear Valley Electric Service Inc.      
Details of reportable segment      
Depreciation on transportation equipment $ 94 $ 95