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Equity Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
A summary of compensation costs charged to income and proceeds from share based compensation, that are recorded to additional paid-in capital and common stock, by award type, are presented below for the years ended December 31:
202020192018
Compensation costs charged to income:
ESPP$323 283 242 
Restricted stock and deferred restricted stock3,230 3,123 1,875 
Total compensation costs charged to income$3,553 3,406 2,117 
Proceeds from the exercise of stock options and similar instruments:
ESPP1,830 1,603 1,371 
Total proceeds from the exercise of stock options and similar instruments$1,830 1,603 1,371 
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of SJW Group’s restricted and deferred restricted stock awards under the Plan as of December 31, 2020, and changes during the year ended December 31, 2020, are presented below:
UnitsWeighted-
Average Grant-
Date Fair Value
Outstanding as of January 1, 2020174,764 $46.63 
Granted68,995 $67.50 
Issued(61,155)$44.92 
Forfeited(4,498)$55.80 
Outstanding as of December 31, 2020178,106 $53.43 
Shares vested as of December 31, 202068,317 $34.55 
Schedule of Nonvested Restricted Stock Units Activity
A summary of the status of SJW Group’s nonvested restricted and deferred restricted stock awards under the Plan as of December 31, 2020, and changes during the year ended December 31, 2020, are presented below:
UnitsWeighted-  Average Grant-
Date Fair Value
Nonvested as of January 1, 202093,153 $39.57 
Granted68,995 $67.50 
Vested(50,210)$59.17 
Forfeited(2,149)$54.33 
Nonvested as of December 31, 2020109,789 $65.18