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Earnings per Share/Capital Stock - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Capital stock                  
Options outstanding (in shares)   0     0     0 0
Sale of stock, number of shares issued in transaction (in shares)   201,212     335,449     535,760 791,097
Sale of stock, consideration received on transaction         $ 27,000     $ 40,500 $ 60,000
Payments for commissions   $ 200     $ 400     $ 600 $ 900
Issuances of Common Shares under stock-based compensation plans (in shares)               27,639 25,164
Payment, tax withholding, share-based payment arrangement               $ 1,328 $ 1,142
Dividends paid               $ 55,096 $ 49,384
Dividends declared per common share (in dollars per share)   $ 0.5040     $ 0.4655     $ 1.4350 $ 1.3255
Issuance of Common Shares from an at-the-market offering program, net of issuance costs   $ 14,624   $ 25,648 $ 26,881 $ 16,724 $ 15,584    
AWR                  
Capital stock                  
Dividends paid   19,400     17,500     $ 55,100 $ 49,400
GSWC                  
Capital stock                  
Sale of stock, consideration received on transaction   14,700              
Payment, tax withholding, share-based payment arrangement               1,189 1,067
Dividends paid   19,500     $ 17,500     $ 37,500 17,500
Issuance of Common Shares from an at-the-market program, net of issuance costs (in shares) 3.6500             3.6500  
Issuance of Common Shares from an at-the-market offering program, net of issuance costs $ 50,000   $ 50,005         $ 50,000  
ASUS                  
Capital stock                  
Dividends paid   $ 6,000           $ 6,000 $ 16,000
Restricted Stock                  
Capital stock                  
Restricted stock units outstanding (in shares)   154,489     135,575     154,489 135,575