Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 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	46,181			23.67
Forfeited	(4,796	)		23.88
Vested	-			-
Share unit awards issued	-			-
Nonvested share units at end of period	306,919		$	23.67

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	(325	)		22.21
Nonvested stock units at end of period	70,867		$	22.36

Summary Of Stock Option Transactions

				Weighted	Weighted
				Average	Average		Aggregate
				Exercise	Remaining		Intrinsic
	Shares			Price	Life (years)		Value
Options:
Outstanding at beginning of period	3,376,960		$	20.03
Granted	-			-
Forfeited	(7,486	)		17.69
Expired	(26,976	)		23.56
Exercised	(473,351	)		16.63
Outstanding at end of period	2,869,147		$	20.56	4.6	$	14,579,511
Exercisable at end of period	2,724,869		$	20.74	4.5	$	13,451,257

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	(96,070	)		18.76
Forfeited	(1,607	)		17.23
Nonvested share units at end of period	127,912		$	19.22

Performance Share Units [Member]

Summary Of Compensation Costs

		Six Months Ended				Three Months Ended
		June 30,				June 30,
		2012		2011		2012		2011
Stock-based compensation for performance share units
within operations and maintenance expenses	$	1,058	$	361	$	610	$	260

Restricted Stock Units [Member]

Summary Of Compensation Costs

		Six Months Ended				Three Months Ended
		June 30,				June 30,
		2012		2011		2012		2011
Stock-based compensation for restricted stock units
within operations and maintenance expenses	$	301	$	141	$	172	$	102

Stock Options [Member]

Summary Of Compensation Costs

		Six Months Ended				Three Months Ended
		June 30,				June 30,
		2012		2011		2012		2011
Stock-based compensation for stock options
within operations and maintenance expenses	$	371	$	769	$	124	$	329
Income tax benefit		295		420		162		46

Restricted Stock [Member]

Summary Of Compensation Costs

		Six Months Ended				Three Months Ended
		June 30,				June 30,
		2012		2011		2012		2011
Stock-based compensation for restricted stock
within operations and maintenance expenses	$	1,136	$	1,100	$	741	$	711