Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2011

Schedule Of Stock Option Transactions

	Nine Months Ended		Three Months Ended
	September 30,		September 30,
	2011	2010	2011	2010
Stock-based compensation for stock options	$    1,105	$    1,540	$       337	$       526
within operations and maintenance expenses
Income tax benefit	561	502	141	201

Performance Share Units [Member]

Schedule Of Nonvested Restricted Stock Transactions

	Number	Weighted
	of	Average
	Share Units	Fair Value
Nonvested share units at beginning of period	-	$           -
Granted	109,375	24.38
Performance criteria adjustment	31,127	24.38
Forfeited	(2,039)	24.38
Vested	-	-
Share unit awards issued	-	-
Nonvested share units at end of period	138,463	$     24.38

Stock Options [Member]

Schedule Of Stock Option Transactions

		Weighted	Weighted
		Average	Average	Aggregate
		Exercise	Remaining	Intrinsic
	Shares	Price	Life (years)	Value
Options:
Outstanding at beginning of period	3,839,197	$ 19.54
Granted	-
Forfeited	(12,356)	18.56
Expired	(10,796)	23.13
Exercised	(375,023)	15.56
Outstanding at end of period	3,441,022	$ 19.97	5.2	$     9,835
Exercisable at end of period	2,956,178	$ 20.31	4.7	$     8,055

Restricted Stock Units (RSUs) [Member]

Schedule Of Nonvested Restricted Stock Transactions

	Number	Weighted
	of	Average
	Stock Units	Fair Value
Nonvested stock units at beginning of period	-	$           -
Granted	44,342	22.21
Vested	-	-
Forfeited	-	-
Nonvested stock units at end of period	44,342	$     22.21

Restricted Stock [Member]

Schedule Of Nonvested Restricted Stock Transactions

	Number	Weighted
	of	Average
	Shares	Fair Value
Nonvested shares at beginning of period	233,387	$     17.62
Granted	16,000	22.44
Vested	(88,704)	18.60
Forfeited	(1,824)	17.23
Nonvested share units at end of period	158,859	$     17.56