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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2020
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

261,398

$

16.35

Granted

106,384

55.43

Performance criteria adjustment

60,009

47.26

Forfeited

(2,481)

35.34

Share units issued

(169,352)

25.75

Nonvested share units at end of period

255,958

33.44

Summary Of RSU Transactions

Number

Weighted

of

Average

Stock Units

Fair Value

Nonvested stock units at beginning of period

141,884

$

34.39

Granted

61,685

49.40

Stock units vested and issued

(40,186)

31.34

Forfeited

(704)

41.87

Nonvested stock units at end of period

162,679

40.76

Assumptions Used In The Pricing Model

2019

Expected term (years)

5.47

Risk-free interest rate

2.53%

Expected volatility

17.7%

Dividend yield

2.44%

Grant date fair value per option

$

5.25

Summary Of Stock Option Transactions

Shares

Weighted Average Exercise Price

Weighted Average Remaining Life (years)

Aggregate Intrinsic Value

Outstanding at beginning of period

1,041,756

$

34.22

Granted

-

-

Forfeited

(17,308)

35.78

Exercised

(63,787)

19.04

Outstanding at end of period

960,661

$

35.20

8.1

$

4,848

Exercisable at end of period

430,660

$

34.43

7.7

$

2,508

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

Three Months Ended

Nine Months Ended

September 30,

September 30,

2020

2019

2020

2019

Stock-based compensation within operations and maintenance expenses

$

918

$

584

$

2,364

$

2,434

Income tax benefit

252

166

660

682

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

Three Months Ended

Nine Months Ended

September 30,

September 30,

2020

2019

2020

2019

Stock-based compensation within operations and maintenance expenses

$

550

$

395

$

1,582

$

1,231

Income tax benefit

148

112

438

348

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

Three Months Ended

Nine Months Ended

September 30,

September 30,

2020

2019

2020

2019

Stock-based compensation within operations and maintenance expenses

$

279

$

637

$

1,046

$

1,625

Income tax benefit

79

180

296

458

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

Three Months Ended

Nine Months Ended

September 30,

September 30,

2020

2020

Stock-based compensation within operations and maintenance expenses

$

103

$

220

Income tax benefit

30

64

Summary Of Restricted Stock Transactions

Number

Weighted

of

Average

Shares

Fair Value

Nonvested restricted stock at beginning of period

-

$

-

Granted

13,228

34.02

Vested

-

-

Nonvested restricted stock at end of period

13,228

$

34.02

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

Three Months Ended

Nine Months Ended

September 30,

September 30,

2020

2019

2020

2019

Stock-based compensation within operations and maintenance expenses

$

175

$

158

$

520

$

540

Income tax benefit

50

46

150

156

Summary Of Nonvested Share Activity

Number

Weighted

of

Average

Stock Awards

Fair Value

Nonvested stock awards at beginning of period

-

$

-

Granted

12,824

40.54

Vested

(12,824)

40.54

Nonvested stock awards at end of period

-

-