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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Actual Allocation of Plan Assets [Table Text Block]
The Committee approves the target asset allocations.  Registrant’s pension and post-retirement plan weighted-average asset allocations at December 31, 2017 and 2016, by asset category are as follows:
 
 
Pension Benefits
 
Post-Retirement
Medical Benefits
Asset Category
 
2017
 
2016
 
2017
 
2016
Actual Asset Allocations:
 
 

 
 

 
 

 
 

Equity securities
 
57
%
 
57
%
 
59
%
 
58
%
Debt securities
 
39
%
 
38
%
 
37
%
 
39
%
Real Estate Funds
 
4
%
 
5
%
 
—
%
 
—
%
Cash equivalents
 
—
%
 
—
%
 
4
%
 
3
%
Total
 
100
%
 
100
%
 
100
%
 
100
%
Schedule of share-based compensation expenses
The following table presents share-based compensation expenses for the years ended December 31, 2017, 2016 and 2015.  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:
 
 
AWR
 
GSWC
 
 
For The Years Ended
December 31,
 
For The Years Ended
December 31,
(in thousands)
 
2017
 
2016
 
2015
 
2017
 
2016
 
2015
Stock-based compensation related to:
 
 

 
 

 
 

 
 

 
 

 
 

Restricted stock units
 
$
2,885

 
$
2,538

 
$
2,754

 
$
2,420

 
$
2,118

 
$
2,443

Total stock-based compensation expense
 
$
2,885

 
$
2,538


$
2,754


$
2,420


$
2,118


$
2,443
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, 2017, and changes during the year ended December 31, 2017, is presented below:
 
Number of
Performance awards
 
Weighted Average
Grant-Date Value
Performance awards at January 1, 2017
102,203

 
$
35.25

Granted
31,558

 
44.10

Performance criteria adjustment
9,332

 
43.40

Vested
(45,214
)
 
29.60

Performance awards at December 31, 2017
97,879

 
$
41.49
Summary of stock option activity
A summary of stock option activity as of December 31, 2017 and changes during the year ended December 31, 2017, are presented below:
 
Number of
Options
 
Weighted
Average
Exercise Price
 
Weighted Average
Remaining
Contractual Term
 
Aggregate
Intrinsic Value
Options outstanding at January 1, 2017
136,560

 
$
17.27

 
 
 
 

Exercised
(52,936
)
 
17.18

 
 
 
 

Forfeited or expired
(14,422
)
 
19.50

 
 
 
 

Options outstanding at December 31, 2017
69,202

 
$
16.87

 
1.35
 
$
1,167,405

Options exercisable at December 31, 2017
69,202

 
$
16.87

 
1.35
 
$
1,167,405
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, 2017, and changes during the year ended December 31, 2017, is presented below:
 
Number of
Restricted Share
Units
 
Weighted Average
Grant-Date Value
Restricted share units at January 1, 2017
107,729

 
$
30.83

Granted
41,755

 
44.46

Vested
(40,695
)
 
39.32

Forfeited
(1,502
)
 
42.32

Restricted share units at December 31, 2017
107,287

 
$
32.75