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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 08, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating revenues   $ 111,005 $ 124,182 $ 106,901 $ 94,728 $ 104,180 $ 124,418 $ 113,195 $ 98,810 $ 436,816 $ 440,603 $ 436,087
Operating income (loss)   22,749 33,975 25,568 18,691 21,959 38,534 42,026 24,576 100,983 127,095 114,192
Net Income   $ 13,789 $ 22,952 $ 16,348 $ 10,782 $ 12,868 $ 21,006 $ 22,792 $ 12,701 $ 63,871 $ 69,367 $ 59,743
Earnings Per Share, Basic   $ 0.37 $ 0.62 $ 0.44 $ 0.29 $ 0.35 $ 0.57 $ 0.62 $ 0.35 $ 1.73 $ 1.88 $ 1.63
Earnings Per Share, Diluted   $ 0.37 $ 0.62 $ 0.44 $ 0.29 $ 0.35 $ 0.57 $ 0.62 $ 0.34 $ 1.72 $ 1.88 $ 1.62
Gain on sale of assets $ 8,300                      
GSWC                        
Operating revenues   $ 75,226 $ 95,564 $ 84,574 $ 74,244 $ 75,136 $ 99,913 $ 88,346 $ 76,906 $ 329,608 $ 340,301 $ 338,702
Operating income (loss)   14,080 27,540 22,645 16,297 15,780 32,986 35,229 21,876 80,562 105,871 95,187
Net Income   $ 7,555 $ 17,919 $ 13,648 $ 8,890 $ 7,309 $ 17,336 18,363 $ 10,749 $ 48,012 53,757 $ 46,969
Gain on sale of assets               8,300        
Cash received for reimbursement of legal and other defense costs                     $ (1,800)  
Restatement Adjustment | American States Utility Services [Member]                        
Operating revenues               $ 1,000