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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 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

104,559

55.65

Performance criteria adjustment

60,136

47.26

Forfeited

(2,141)

33.38

Share units issued

(169,352)

25.75

Nonvested share units at end of period

254,600

33.40

Summary Of RSU Transactions

Number

Weighted

of

Average

Stock Units

Fair Value

Nonvested stock units at beginning of period

141,884

$

34.39

Granted

60,635

49.48

Stock units vested and issued

(39,526)

31.25

Forfeited

(617)

41.75

Nonvested stock units at end of period

162,376

40.72

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

(15,915)

35.77

Exercised

(59,517)

17.93

Outstanding at end of period

966,324

$

35.20

8.3

$

6,802

Exercisable at end of period

434,930

$

34.43

8.0

$

3,398

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

Three Months Ended

Six Months Ended

June 30,

June 30,

2020

2019

2020

2019

Stock-based compensation within operations and maintenance expenses

$

966

$

853

$

1,447

$

1,850

Income tax benefit

265

239

408

516

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

Three Months Ended

Six Months Ended

June 30,

June 30,

2020

2019

2020

2019

Stock-based compensation within operations and maintenance expenses

$

554

$

412

$

1,032

$

837

Income tax benefit

154

116

290

236

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

Three Months Ended

Six Months Ended

June 30,

June 30,

2020

2019

2020

2019

Stock-based compensation within operations and maintenance expenses

$

265

$

661

$

766

$

988

Income tax benefit

75

186

217

278

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

Three Months Ended

Six Months Ended

June 30,

June 30,

2020

2020

Stock-based compensation within operations and maintenance expenses

$

99

$

117

Income tax benefit

29

34

Summary Of Restricted Stock Transactions

Number

Weighted

of

Average

Shares

Fair Value

Nonvested restricted stock at beginning of period

-

$

-

Granted

11,952

33.47

Vested

-

-

Nonvested restricted stock at end of period

11,952

$

33.47

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

Three Months Ended

Six Months Ended

June 30,

June 30,

2020

2019

2020

2019

Stock-based compensation within operations and maintenance expenses

$

170

$

202

$

345

$

382

Income tax benefit

49

58

100

110

Summary Of Nonvested Share Activity

Number

Weighted

of

Average

Stock Awards

Fair Value

Nonvested stock awards at beginning of period

-

$

-

Granted

8,456

40.80

Vested

(8,456)

40.80

Nonvested stock awards at end of period

-

-