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Employee Stock And Incentive Plan (Tables)
12 Months Ended
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Value Of Restricted Stock Units

Years ended December 31,

2019

2018

2017

Weighted average fair value of RSUs granted

$

36.25

$

35.15

$

30.37

Intrinsic value of vested RSUs

1,456

1,605

896

Fair value of vested RSUs

1,341

1,268

751

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

Performance Grant of:

2018

2017

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

25.0%

26.47%

Metric 2 – Company’s TSR compared to the TSR for the companies listed in the Standard and Poor’s Midcap Utilities Index (a market-based condition)

25.0%

26.47%

Metric 3 – Achievement of a targeted cumulative level of rate base growth as a result of acquisitions (a performance-based condition)

25.0%

23.53%

Metric 4 – Achievement of targets for maintaining consolidated operations and maintenance expenses over the three year measurement period (a performance-based condition)

25.0%

23.53%

Summary Of Compensation Costs

Years ended December 31,

2019

2018

2017

Stock-based compensation within operations and maintenance expense

$

2,741

$

4,817

$

4,351

Income tax benefit

767

1,344

1,766

Summary Of Nonvested PSU Transactions

Number of Share Units

Weighted Average Fair Value

Nonvested share units at beginning of period

443,410 

$

27.20 

Granted

-

-

Performance criteria adjustment

(82,921)

33.56 

Forfeited

(9,767)

33.21 

Share units issued

(89,324)

52.39 

Nonvested share units at end of period

261,398 

16.35 

Assumptions Used In The Pricing Model

Years ended December 31,

2019

2018

2017

Expected term (years)

-

3.0 

3.0 

Risk-free interest rate

-

2.43%

1.49%

Expected volatility

-

17.2%

17.9%

Weighted average fair value of PSUs granted

$

-

$

37.42

$

30.79

Intrinsic value of vested PSUs

$

3,181 

$

4,704 

$

3,926 

Fair value of vested PSUs

$

2,569 

$

3,613 

$

3,207 

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

Years ended December 31,

2019

2018

2017

Stock-based compensation within operations and maintenance expense

$

1,650 

$

1,605 

$

1,183 

Income tax benefit

466 

456 

489 

Summary Of Nonvested RSU Transactions

Number of Stock Units

Weighted Average Fair Value

Nonvested stock units at beginning of period

130,085 

$

33.13 

Granted

57,290 

36.25 

Stock units vested and issued

(40,971)

32.89 

Forfeited

(4,520)

35.28 

Nonvested stock units at end of period

141,884 

34.39 

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

Years ended December 31,

2019

2018

2017

Stock-based compensation within operations and maintenance expenses

$

2,280 

$

546 

$

245 

Income tax benefit

643 

184 

208 

Assumptions Used In The Pricing Model

Years ended December 31,

2019

2018

2017

Expected term (years)

5.47

5.46

5.45

Risk-free interest rate

2.53%

2.72%

2.01%

Expected volatility

17.7%

17.2%

17.7%

Dividend yield

2.44%

2.37%

2.51%

Grant date fair value per option

$

5.25

$

5.10

$

4.07

Summary Of Stock Option Transactions

Shares

Weighted Average Exercise Price

Weighted Average Remaining Life (years)

Aggregate Intrinsic Value

Outstanding, beginning of year

422,972 

$

25.97 

Granted

769,115 

35.94 

Forfeited

(36,479)

35.46 

Expired / Cancelled

(2,532)

32.28 

Exercised

(119,306)

15.91 

Outstanding at end of year

1,033,770 

$

34.20 

8.4 

$

13,171 

Exercisable at end of year

164,117 

$

26.86 

5.4 

$

3,296 

Summary Of Stock Options Exercised And Vested

Years ended December 31,

2019

2018

2017

Intrinsic value of options exercised

$

2,552

$

1,806

$

2,767

Fair value of options vested

422

156

-

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:

$13.00 - 14.99

47,388

0.1

$

13.72

47,388

$

13.72

$15.00 - 33.99

99,661

7.2

30.47

67,649

30.47

$34.00 - 34.99

138,113

8.2

34.51

46,214

34.51

$35.00 - 35.99

748,608

9.2

35.93

2,866

35.44

1,033,770

8.4

34.20

164,117

26.86

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

Years ended December 31,

2019

2018

2017

Stock-based compensation within operations and maintenance expense

$

698

$

600

$

563

Income tax benefit

202

173

233

Summary Of Value Of Stock Awards

Years ended December 31,

2019

2018

2017

Intrinsic and fair value of stock awards vested

$

698

$

600

$

563

Weighted average fair value of stock awards granted

41.75

34.95

34.42

Summary Of Nonvested Share Activity

Number of Stock Awards

Weighted Average Fair Value

Nonvested stock awards at beginning of period

-

$

-

Granted

16,714

41.75

Vested

(16,714)

41.75

Nonvested stock awards at end of period

-

-