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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating revenues $ 124,200 $ 133,688 $ 121,278 $ 109,077 $ 112,993 $ 134,496 $ 124,647 $ 101,733     $ 488,243 $ 473,869 $ 436,816
Net Income $ 20,211 $ 26,530 $ 25,612 $ 14,072 $ 16,700 $ 28,006 $ 26,784 $ 12,852     $ 86,425 $ 84,342 $ 63,871
Earnings Per Share, Basic $ 0.55 $ 0.72 $ 0.69 $ 0.38 $ 0.45 $ 0.76 $ 0.72 $ 0.35     $ 2.34 $ 2.28 $ 1.73
Earnings Per Share, Diluted $ 0.54 $ 0.72 $ 0.69 $ 0.38 $ 0.45 $ 0.76 $ 0.72 $ 0.35     $ 2.33 $ 2.28 $ 1.72
Operating Income $ 29,277 $ 39,807 $ 35,716 $ 25,699 $ 24,724 $ 42,724 $ 39,430 $ 20,195     $ 130,499 $ 127,073 $ 100,983
GSWC                          
Operating revenues 73,438 98,701 94,753 82,392 81,233 107,245 95,548 75,352     349,284 359,378 329,608
Net Income 11,707 21,143 20,919 11,202 11,981 23,362 22,298 9,022     64,971 66,663 48,012
Operating Income $ 17,480 $ 33,149 $ 30,175 22,092 $ 18,746 $ 36,982 $ 34,037 $ 15,327     102,896 105,092 80,562
Water Service Utility Operations [Member] | GSWC                          
Operating revenues                     330,637 319,830 295,258
Retroactive pretax income adjustment due to GRC delay       $ 4,000                  
Operating Income                     $ 97,896 93,895 74,342
Electric: | GSWC                          
Operating revenues                       39,548 34,350
Net Income                   $ 5,422      
Retroactive pretax income adjustment due to GRC delay                 $ 1,400     2,300  
Operating Income                       $ 11,197 $ 6,220