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Utility Plant and Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Utility plant utilized in continuing operations by major asset class      
Total amortized intangible assets $ 30,321 $ 29,989  
Total utility plant, at cost 1,930,224 1,839,421  
Less - accumulated depreciation (568,326) (543,263)  
Construction work in progress (150,145) (119,547)  
Net utility plant 1,512,043 1,415,705 $ 1,296,310
American States Utility Services [Member] | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 571 571  
Water Service Utility Operations [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,817,717 1,730,996  
Water Service Utility Operations [Member] | Land      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 18,234 18,066  
Water Service Utility Operations [Member] | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 28,906 28,578  
Water Service Utility Operations [Member] | Source of water supply      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 92,166 91,685  
Water Service Utility Operations [Member] | Pumping      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 190,901 178,058  
Water Service Utility Operations [Member] | Water treatment      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 81,272 78,048  
Water Service Utility Operations [Member] | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,277,361 1,219,285  
Water Service Utility Operations [Member] | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 128,877 117,276  
Electric:      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 112,507 108,425  
Electric: | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,200 1,200  
Electric: | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 87,461 84,018  
Electric: | Generation      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 12,583 12,583  
Electric: | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost [1] 12,463 11,824  
GSWC      
Utility plant utilized in continuing operations by major asset class      
Total amortized intangible assets 28,508 29,418  
Total utility plant, at cost 1,784,402 1,808,867  
Less - accumulated depreciation (502,283) (531,801)  
Construction work in progress (118,370) (117,676)  
Net utility plant 1,400,489 1,394,742  
GSWC | Water Service Utility Operations [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,784,402 1,700,442  
Net utility plant 1,400,489 1,322,062 1,218,468
GSWC | Water Service Utility Operations [Member] | Land      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 18,234 18,066  
GSWC | Water Service Utility Operations [Member] | Intangible Assets [Member]      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 28,906 28,578  
GSWC | Water Service Utility Operations [Member] | Source of water supply      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 92,166 91,685  
GSWC | Water Service Utility Operations [Member] | Pumping      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 190,901 178,058  
GSWC | Water Service Utility Operations [Member] | Water treatment      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 81,272 78,048  
GSWC | Water Service Utility Operations [Member] | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 1,277,361 1,219,285  
GSWC | Water Service Utility Operations [Member] | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 95,562 86,722  
GSWC | Electric:      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 0 108,425  
Net utility plant   72,680 $ 62,624
GSWC | Electric: | Transmission and distribution      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 0 84,018  
GSWC | Electric: | Generation      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost 0 12,583  
GSWC | Electric: | General      
Utility plant utilized in continuing operations by major asset class      
Total utility plant, at cost [1] 0 11,824  
Conservation [Member]      
Utility plant utilized in continuing operations by major asset class      
Total amortized intangible assets 9,486 9,486  
Conservation [Member] | GSWC      
Utility plant utilized in continuing operations by major asset class      
Total amortized intangible assets $ 9,486 $ 9,486  
[1]      Includes intangible assets of $1.2 million for the years ended December 31, 2020 and 2019 for studies performed in association with the electric segment.