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Earnings per Share/Capital Stock - Narrative (Details) - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Capital stock    
Options outstanding (in shares) 0 0
Exercise of stock options and other issuances of Common Shares (in shares) 14,043 19,348
Other financing activities $ (883,000) $ (1,188,000)
Dividends paid $ 14,695,000 $ 13,485,000
Common Stock, Dividends, Per Share, Cash Paid $ 0.3975 $ 0.365
Parent Company    
Capital stock    
Dividends paid $ 14,700,000 $ 13,500,000
GSWC    
Capital stock    
Exercise of stock options and other issuances of Common Shares (in shares) 1  
Other financing activities $ (808,000) (1,088,000)
Dividends paid 24,700,000 $ 13,500,000
Exercise of stock options and other issuances of Common Shares (in shares) $ 10,000,000  
Restricted Stock    
Capital stock    
Restricted stock units outstanding (in shares) 106,817 96,586