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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 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

118,924

52.09

Performance criteria adjustment

18,954

36.77

Forfeited

(653)

36.09

Share units issued

(169,352)

25.75

Nonvested share units at end of period

229,271

Summary Of RSU Transactions

Number

Weighted

of

Average

Stock Units

Fair Value

Nonvested stock units at beginning of period

141,884

$

34.39

Granted

68,901

47.10

Stock units vested and issued

(38,643)

31.05

Forfeited

(90)

36.01

Nonvested stock units at end of period

172,052

40.17

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

Weighted

Weighted

Average

Average

Aggregate

Exercise

Remaining

Intrinsic

Shares

Price

Life (years)

Value

Outstanding at beginning of period

1,041,756

$

34.22

Granted

-

-

Forfeited

(9,516)

35.75

Exercised

(56,106)

16.93

Outstanding at end of period

976,134

$

35.20

8.6

$

5,366

Exercisable at end of period

438,341

$

34.43

8.2

$

2,750

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

Three Months Ended

March 31,

2020

2019

Stock-based compensation within operations and maintenance expenses

$

510

$

997

Income tax benefit

144

227

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

Three Months Ended

March 31,

2020

2019

Stock-based compensation within operations and maintenance expenses

$

486

$

425

Income tax benefit

136

120

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

Three Months Ended

March 31,

2020

2019

Stock-based compensation within operations and maintenance expenses

$

501

$

328

Income tax benefit

142

92

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

Three Months Ended

March 31,

2020

Stock-based compensation within operations and maintenance expenses

$

18

Income tax benefit

5

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

March 31,

2020

2019

Stock-based compensation within operations and maintenance expenses

$

175

$

180

Income tax benefit

51

52

Summary Of Nonvested Share Activity

Number

Weighted

of

Average

Stock Awards

Fair Value

Nonvested stock awards at beginning of period

-

$

-

Granted

4,207

41.58

Vested

(4,207)

41.58

Nonvested stock awards at end of period

-

-