Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2023

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	556,462	$	42.77
Granted	161,981		45.06
Performance criteria adjustment	9,521		42.60
Actual vested	(168,549)		53.77
Forfeited	(9,837)		43.94
Nonvested share units at end of period	549,578		40.05

Summary Of RSU Transactions

	Number	Weighted
	of	Average
	Stock Units	Fair Value
Nonvested stock units at beginning of period	180,306	$	45.94
Granted	73,696		45.61
Stock units vested and issued	(52,611)		49.26
Forfeited	(3,794)		44.99
Nonvested stock units at end of period	197,597		44.94

Summary Of Stock Option Transactions

		Weighted		Weighted
		Average		Average	Aggregate
		Exercise		Remaining	Intrinsic
	Shares	Price		Life (years)	Value
Outstanding at beginning of period	820,061	$	36.29
Granted	74,632		45.39
Forfeited	(2,076)		45.31
Expired	(664)		35.20
Exercised	(5,943)		35.21
Outstanding at end of period	886,010	$	37.04	6.0	$	3,347
Exercisable at end of period	763,196	$	35.71	5.5	$	3,347

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,
	2023		2022		2023		2022
Stock-based compensation within operations and maintenance expenses	$	1,962	$	1,692	$	4,405	$	3,342
Income tax benefit		492		485		1,104		952

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,
	2023		2022		2023		2022
Stock-based compensation within operations and maintenance expenses	$	759	$	727	$	1,440	$	1,504
Income tax benefit		190		209		361		428

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,
	2023		2022		2023		2022
Stock-based compensation within operations and maintenance expenses	$	222	$	141	$	299	$	241
Income tax benefit		56		41		75		69

Assumptions Used In The Pricing Model

	2023		2022
Expected term (years)		5.5		5.5
Risk-free interest rate		4.03%		1.92%
Expected volatility		27.80%		26.50%
Dividend yield		2.53%		2.37%
Grant date fair value per option	$	11.37	$	9.34

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,
	2023		2022		2023		2022
Stock-based compensation within operations and maintenance expenses	$	13	$	13	$	25	$	25
Income tax benefit		4		3		7		7

Summary Of Restricted Stock Transactions

	Number	Weighted
	of	Average
	Shares	Fair Value
Nonvested restricted stock at beginning of period	1,170	$	42.75
Granted	-		-
Vested	-		-
Nonvested restricted stock 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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2023		2022		2023		2022
Stock-based compensation within operations and maintenance expenses	$	570	$	165	$	780	$	357
Income tax benefit		160		47		219		103

Summary Of Nonvested Share Activity

	Number	Weighted
	of	Average
	Stock Awards	Fair Value
Nonvested stock awards at beginning of period	-	$	-
Granted	18,676		41.78
Vested	(18,676)		(41.78)
Nonvested stock awards at end of period	-		-