Stock-Based Compensation (Tables)

9 Months Ended

Sep. 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	162,030		45.06
Performance criteria adjustment	(14,805)		43.36
Actual vested	(168,549)		53.77
Forfeited	(12,513)		44.10
Nonvested share units at end of period	522,625	$	39.88

Summary Of RSU Transactions

	Number	Weighted
	of	Average
	Stock Units	Fair Value
Nonvested stock units at beginning of period	180,306	$	45.94
Granted	75,414		45.53
Stock units vested and issued	(52,744)		49.25
Forfeited	(5,104)		45.54
Nonvested stock units at end of period	197,872	$	45.07

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

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	(6,553)		34.98
Outstanding at end of period	885,400	$	37.04	5.8	$	206
Exercisable at end of period	762,586	$	35.72	5.3	$	206

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	-		-

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	(1,170)		(42.75)
Nonvested restricted stock at end of period	-	$	-

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,
	2023		2022		2023		2022
Stock-based compensation within operations and maintenance expenses	$	1,039	$	1,676	$	5,444	$	5,018
Income tax benefit		260		309		1,364		1,261

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,
	2023		2022		2023		2022
Stock-based compensation within operations and maintenance expenses	$	746	$	702	$	2,186	$	2,206
Income tax benefit		187		126		548		554

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,
	2023		2022		2023		2022
Stock-based compensation within operations and maintenance expenses	$	181	$	139	$	480	$	380
Income tax benefit		45		26		120		95

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,
	2023		2022		2023		2022
Stock-based compensation within operations and maintenance expenses	$	12	$	13	$	37	$	38
Income tax benefit		3		4		10		11

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,
	2023		2022		2023		2022
Stock-based compensation within operations and maintenance expenses	$	-	$	165	$	780	$	522
Income tax benefit		-		48		219		151