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Stock-Based Compensation Plans (Tables)
12 Months Ended
Dec. 31, 2023
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, 2023, 2022 and 2021.  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)202320222021202320222021
Stock-based compensation related to:
Restricted stock units$3,298 $2,571 $2,566 $2,994 $2,269 $2,313 
Total stock-based compensation expense$3,298 $2,571 $2,566 $2,994 $2,269 $2,313 
Schedule of assumptions used to estimate fair value of each option grant on the grant date using the Black-Scholes option-pricing model will be earned based on Registrant’s TSR compared to the TSR for a specific peer group of investor-owned water companies.
A summary of the status of Registrant’s outstanding performance awards to officers as of December 31, 2023, and changes during the year ended December 31, 2023, is presented below:

Number of
Performance awards
Weighted Average
Grant-Date Value
Performance awards at January 1, 202349,435 $83.70 
Granted19,696 96.04 
Performance criteria adjustment8,321 91.73 
Vested(12,095)89.59 
Performance awards at December 31, 202365,357 $87.35 
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, 2023, and changes during the year ended December 31, 2023, is presented below:
 Number of
Restricted Share
Units
Weighted Average
Grant-Date Value
Restricted share units at January 1, 202347,552 $49.01 
Granted19,837 94.71 
Vested(16,574)87.28 
Forfeited(488)92.84 
Restricted share units at December 31, 202350,327 $54.00