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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of share-based compensation expenses
The following table presents share-based compensation expenses for the years ended December 31, 2024, 2023 and 2022.  These expenses resulting from restricted stock units, including performance awards, are included in administrative and general expenses in AWR’s and GSWC’s statements of income:
 AWRGSWC
 For The Years Ended December 31,For The Years Ended December 31,
(in thousands)202420232022202420232022
Stock-based compensation related to:
Restricted stock units$3,744 $3,298 $2,571 $3,279 $2,994 $2,269 
Total stock-based compensation expense$3,744 $3,298 $2,571 $3,279 $2,994 $2,269 
Schedule of assumptions used to estimate fair value of each option grant on the grant date using the Black-Scholes option-pricing model
A summary of the status of Registrant’s outstanding performance awards to officers as of December 31, 2024, and changes during the year ended December 31, 2024, is presented below:

Number of
Performance awards		Weighted Average
Grant-Date Value
Performance awards at January 1, 202465,357 $87.35 
Granted28,503 73.16 
Performance criteria adjustment15,251 83.31 
Vested(22,603)79.54 
Performance awards at December 31, 202486,508 $84.00 
Summary of the status of Registrant's outstanding restricted stock units to employees and directors A summary of the status of Registrant’s outstanding RSUs, excluding performance awards, to employees and directors as of December 31, 2024, and changes during the year ended December 31, 2024, is presented below:
 Number of
Restricted Share
Units		Weighted Average
Grant-Date Value
Restricted share units at January 1, 202450,327 $54.00 
Granted27,051 74.02 
Vested(18,301)86.27 
Forfeited(786)80.70 
Restricted share units at December 31, 202458,291 $52.80