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Employee Stock And Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2022
Performance Share Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Performance Goals

Metric 1 – Company’s total shareholder return (“TSR”) compared to the TSR for a specific peer group of investor-owned utilities (a market-based condition)

38.46%

Metric 2 – Achievement of a targeted cumulative level of rate base growth as a result of acquisitions (a performance-based condition)

30.77%

Metric 3 – Achievement of targets for maintaining consolidated operations and maintenance expenses over the three year measurement period (a performance-based condition)

30.77%

Summary Of Compensation Costs

Years ended December 31,

2022

2021

2020

Stock-based compensation within operations and maintenance expense

$

7,950

$

7,150

$

3,630

Income tax benefit

1,997

2,038

957

Summary Of Nonvested PSU Transactions

Number of Share Units

Weighted Average Fair Value

Nonvested share units at beginning of period

355,384 

$

42.19 

Granted

161,968

42.33 

Performance criteria adjustment

100,227

46.21 

Forfeited

(61,117)

43.89 

Nonvested share units at end of period

556,462 

42.77

Assumptions Used In The Pricing Model

Years ended December 31,

2022

2021

2020

Expected term (years)

3.0

3.0

3.0

Risk-free interest rate

1.75%

0.24%

0.66%

Expected volatility

31.9%

32.1%

24.2%

Weighted average fair value of PSUs granted

$

42.33

$

43.18

$

55.25

Intrinsic value of vested PSUs

$

-

$

6,050

$

9,030

Fair value of vested PSUs

$

-

$

5,321

$

5,215

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

Years ended December 31,

2022

2021

2020

Stock-based compensation within operations and maintenance expense

$

2,927

$

3,360

$

2,180

Income tax benefit

736

953

585

Summary Of Nonvested RSU Transactions

Number of Stock Units

Weighted Average Fair Value

Nonvested stock units at beginning of period

193,687 

$

43.76 

Granted

72,092 

44.74 

Stock units vested and issued

(65,839)

38.42 

Forfeited

(19,634)

45.30 

Nonvested stock units at end of period

180,306

45.94 

Summary Of Value Of Restricted Stock Units

Years ended December 31,

2022

2021

2020

Weighted average fair value of RSUs granted

$

44.74

$

44.44

$

49.19

Intrinsic value of vested RSUs

3,090

2,108

2,130

Fair value of vested RSUs

2,483

1,726

1,203

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

Years ended December 31,

2022

2021

2020

Stock-based compensation within operations and maintenance expenses

$

451

$

480

$

1,322

Income tax benefit

140

136

374

Assumptions Used In The Pricing Model

2022

Expected term (years)

5.48

Risk-free interest rate

1.92%

Expected volatility

26.5%

Dividend yield

2.37%

Grant date fair value per option

$

9.34

Summary Of Stock Option Transactions

Shares

Weighted Average Exercise Price

Weighted Average Remaining Life (years)

Aggregate Intrinsic Value

Outstanding, beginning of year

813,492

35.37

Granted

85,527

45.19

Forfeited

(9,149)

44.32

Expired / Cancelled

(125)

35.94

Exercised

(69,684)

35.52

Outstanding at end of year

820,061

$

36.29

6.2

$

9,383

Exercisable at end of year

745,000

$

35.39

5.9

$

9,191

Summary Of Stock Options Exercised And Vested

Years ended December 31,

2022

2021

2020

Intrinsic value of options exercised

$

960

$

1,709

$

1,849

Fair value of options vested

1,203

1,485

1,673

Summary Of Options Outstanding And Options Excercisable

Options Outstanding

Options Exercisable

Shares

Weighted Average Remaining Life (years)

Weighted Average Exercise Price

Shares

Weighted Average Exercise Price

Range of prices:

$30.00 - 33.99

54,467

4.1

$

30.47

54,467

$

30.47

$34.00 - 34.99

90,194

5.2

34.51

90,194

34.51

$35.00 - 35.99

597,894

6.2

35.93

597,894

35.93

$36.00 and above

77,506

9.1

45.17

2,445

45.19

820,061

6.2

$

36.29

745,000

$

35.39

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

Years ended December 31,

2022

2021

2020

Stock-based compensation within operations and maintenance expense

$

50

$

130

$

333

Income tax benefit

15

37

96

Summary Of Value Of Restricted Stock Awards

Number of Shares

Weighted Average Fair Value

Nonvested shares at beginning of period

1,068

$

46.83

Granted

1,170

42.75

Vested

(1,068)

(46.83)

Nonvested shares at end of period

1,170

$

42.75

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

Years ended December 31,

2022

2021

2020

Stock-based compensation within operations and maintenance expense

$

715

$

700

$

695

Income tax benefit

207

202

201

Summary Of Value Of Stock Awards

Years ended December 31,

2022

2021

2020

Intrinsic and fair value of stock awards vested

$

715

$

700

$

695

Weighted average fair value of stock awards granted

46.44

47.46

41.97

Summary Of Nonvested Share Activity

Number of Stock Awards

Weighted Average Fair Value

Nonvested stock awards at beginning of period

-

$

-

Granted

15,397

46.44

Vested

(15,397)

46.44

Nonvested stock awards at end of period

-

-