Employee Stock And Incentive Plan (Tables)

12 Months Ended

Dec. 31, 2012

Summary Of Nonvested PSU Transactions

	Number		Weighted
	of		Average
	Share Units		Fair Value
Nonvested share units at beginning of period	137,584	$	24.38
Granted	127,950		23.89
Performance criteria adjustment	79,635		23.52
Forfeited	(13,944)		23.87
Vested	-		-
Share unit awards issued	-		-
Nonvested share units at end of period	331,225	$	23.52

Summary Of Nonvested RSU Transactions

	Number		Weighted
	of		Average
	Stock Units		Fair Value
Nonvested stock units at beginning of period	44,342	$	22.21
Granted	37,850		22.49
Vested	(11,000)		22.21
Forfeited	(2,724)		22.24
Nonvested stock units at end of period	68,468	$	22.36

Summary Of Stock Option Transactions

			Weighted	Weighted
			Average	Average		Aggregate
			Exercise	Remaining		Intrinsic
	Shares		Price	Life (years)		Value
Options:
Outstanding, beginning of year	3,376,960	$	20.03
Granted	-		-
Forfeited	(9,015)		17.60
Expired	(37,226)		24.25
Exercised	(833,437)		17.51
Outstanding, end of year	2,497,282	$	20.81	4.2	$	13,243
Exercisable, end of year	2,354,533	$	21.03	4.0	$	12,061

Summary Of Stock Options Exercised And Vested

	Years ended December 31,
		2012		2011		2010
Intrinsic value of options exercised	$	5,547	$	3,071	$	2,700
Fair value of options vested		1,318		2,077		2,373

Summary Of Options Outstanding And Options Excercisable

	Options Outstanding				Options Exercisable
		Weighted		Weighted			Weighted
		Average		Average			Average
		Remaining		Exercise			Exercise
	Shares	Life (years)		Price	Shares		Price
Range of prices:
$10.00 - 12.99	65,437	0.2	$	12.48	65,437	$	12.48
$13.00 - 16.99	232,439	1.2		16.15	232,439		16.15
$17.00 - 19.99	1,057,617	5.2		18.18	914,868		18.35
$20.00 - 22.99	339,055	5.2		20.18	339,055		20.18
$23.00 - 27.99	375,282	4.2		23.26	375,282		23.26
$28.00 - 29.99	427,452	3.2		29.46	427,452		29.46
	2,497,282	4.2	$	20.81	2,354,533	$	21.03

Summary Of Nonvested Share Activity - Restricted Stock

	Number		Weighted
	of		Average
	Shares		Fair Value
Nonvested shares at beginning of period	207,989	$	18.66
Granted	17,600		23.09
Vested	(105,473)		18.80
Forfeited	(2,388)		17.25
Nonvested shares at end of period	117,728	$	19.23

Summary Of Value Of Restricted Stock Awards

	Years ended December 31,
		2012		2011		2010
Intrinsic value of restricted stock awards vested	$	2,384	$	2,020	$	1,147
Fair value of restricted stock awards vested		1,971		1,650		1,270
Weighted average fair value of restricted stock awards granted		23.09		22.21		17.19

Performance Share Units [Member]

Assumptions Used In The Pricing Model

	Years ended
	December 31,
		2012		2011
Expected term (years)		3.0		3.0
Risk-free interest rate		0.4%		1.2%
Expected volatility		22.1%		29.7%
Grant date fair value per
performance share unit	$	23.89	$	24.38

Stock Options [Member]

Assumptions Used In The Pricing Model

	Year ended
	December 31,
	2010
Expected term (years)		6.0
Risk-free interest rate		2.8%
Expected volatility		26.7%
Dividend yield		3.3%
Grant date fair value per option	$	3.49

Summary Of Compensation Costs

	Years ended December 31,
		2012		2011		2010
Stock-based compensation within
operations and maintenance expense	$	612	$	1,361	$	1,944
Income tax benefit		580		673		726

Restricted Stock [Member]

Summary Of Compensation Costs

	Years ended December 31,
		2012		2011		2010
Stock-based compensation within
operations and maintenance expense	$	1,739	$	1,800	$	1,927
Income tax benefit		721		740		793