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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of PSU Transactions

Number

Weighted

of

Average

Share Units

Fair Value

Nonvested share units at beginning of period

355,384

$

42.19

Granted

160,245

42.31

Forfeited

(3,161)

46.39

Nonvested share units at end of period

512,468

42.20

Summary Of RSU Transactions

Number

Weighted

of

Average

Stock Units

Fair Value

Nonvested stock units at beginning of period

193,687

$

43.76

Granted

71,570

45.10

Stock units vested and issued

(54,079)

36.63

Forfeited

(653)

43.77

Nonvested stock units at end of period

210,525

46.08

Summary Of Stock Option Transactions

Weighted

Weighted

Average

Average

Aggregate

Exercise

Remaining

Intrinsic

Shares

Price

Life (years)

Value

Outstanding at beginning of period

813,492

$

35.37

Granted

84,296

45.19

Forfeited

(863)

35.94

Expired

(125)

35.94

Exercised

(28,516)

35.48

Outstanding at end of period

868,284

$

36.33

7.0

$

12,853,795

Exercisable at end of period

783,723

$

35.37

6.6

$

12,351,503

Performance Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Compensation Costs

Three Months Ended

March 31,

2022

2021

Stock-based compensation within operations and maintenance expenses

$

1,650

$

1,641

Income tax benefit

467

462

Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Compensation Costs

Three Months Ended

March 31,

2022

2021

Stock-based compensation within operations and maintenance expenses

$

777

$

604

Income tax benefit

219

169

Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Compensation Costs

Three Months Ended

March 31,

2022

2021

Stock-based compensation within operations and maintenance expenses

$

100

$

211

Income tax benefit

28

60

Assumptions Used In The Pricing Model

2022

Expected term (years)

5.48

Risk-free interest rate

1.92%

Expected volatility

26.50%

Dividend yield

2.37%

Grant date fair value per option

$

9.34

Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Compensation Costs

Three Months Ended

March 31,

2022

2021

Stock-based compensation within operations and maintenance expenses

$

12

$

93

Income tax benefit

4

27

Summary Of Restricted Stock Transactions

Number

Weighted

of

Average

Shares

Fair Value

Nonvested restricted stock at beginning of period

1,068

$

46.83

Granted

-

-

Vested

-

-

Nonvested restricted stock at end of period

1,068

$

46.83

Stock Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Compensation Costs

Three Months Ended

March 31,

2022

2021

Stock-based compensation within operations and maintenance expenses

$

192

$

175

Income tax benefit

56

51

Summary Of Nonvested Share Activity

Number

Weighted

of

Average

Stock Awards

Fair Value

Nonvested stock awards at beginning of period

-

$

-

Granted

3,724

51.66

Vested

(3,724)

(51.66)

Nonvested stock awards at end of period

-

-