Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2014

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary Of Nonvested PSU Transactions

	Number	Weighted
	of	Average
	Share Units	Fair Value
Nonvested share units at beginning of period	528,092	$	21.25
Granted	143,630		25.31
Performance criteria adjustment	74,616		22.09
Forfeited	(13,190)		23.56
Share units vested in prior period and issued in current period	18,000		19.51
Share units issued	(174,148)		18.93
Nonvested share units at end of period	577,000	$	22.96

Summary Of Nonvested RSU Transactions

	Number	Weighted
	of	Average
	Stock Units	Fair Value
Nonvested stock units at beginning of period	112,666	$	20.16
Granted	41,150		24.80
Stock units vested but not paid	(5,750)		17.99
Stock units vested and paid	(24,772)		17.77
Forfeited	(729)		21.77
Nonvested stock units at end of period	122,565	$	22.29

Summary Of Stock Option Transactions

		Weighted		Weighted
		Average		Average	Aggregate
		Exercise		Remaining	Intrinsic
	Shares	Price		Life (years)	Value
Outstanding at beginning of period	1,538,110	$	16.82
Forfeited	-		-
Expired	(3,706)		17.87
Exercised	(320,769)		15.18
Outstanding and exercisable at end of period	1,213,635	$	17.25	3.2	$	7,628

Summary Of Nonvested Share Activity - Restricted Stock

	Number	Weighted
	of	Average
	Shares	Fair Value
Nonvested shares at beginning of period	62,500	$	17.70
Granted	14,000		25.19
Vested	(45,250)		20.02
Forfeited	-		-
Nonvested shares at end of period	31,250	$	17.70

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,
	2014		2013		2014		2013
Stock-based compensation for performance share units within operations and maintenance expenses	$	1,220	$	1,044	$	3,689	$	2,723
Income tax benefit		495		424		1,506		1,109

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,
	2014		2013		2014		2013
Stock-based compensation for restricted stock units within operations and maintenance expenses	$	295	$	214	$	827	$	612
Income tax benefit		122		88		342		252

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,
	2014		2013		2014		2013
Stock-based compensation for stock options within operations and maintenance expenses	$	-	$	-	$	-	$	30
Income tax benefit		2		110		98		433

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,
	2014		2013		2014		2013
Stock-based compensation for restricted stock within operations and maintenance expenses	$	92	$	92	$	629	$	678
Income tax benefit		38		38		261		281