Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

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	582,644	$	22.98
Granted	123,820		26.54
Performance criteria adjustment	5,114		25.59
Forfeited	(3,713)		25.69
Share units vested	(34,500)		26.88
Share units issued	(217,014)		18.49
Nonvested share units at end of period	456,351	$	25.79

Summary Of Nonvested RSU Transactions

	Number	Weighted
	of	Average
	Stock Units	Fair Value
Nonvested stock units at beginning of period	122,565	$	22.29
Granted	37,650		26.26
Stock units vested but not paid	11,500		17.99
Stock units vested and paid	(63,387)		19.44
Forfeited	-		-
Nonvested stock units at end of period	108,328	$	24.88

Summary Of Stock Option Transactions

		Weighted		Weighted
		Average		Average	Aggregate
		Exercise		Remaining	Intrinsic
	Shares	Price		Life (years)	Value
Outstanding at beginning of period	1,084,992	$	17.06
Forfeited	-		-
Expired	-		-
Exercised	(170,270)		16.75
Outstanding and exercisable at end of period	914,722	$	17.12	3.1	$	8,443

Summary Of Nonvested Share Activity - Restricted Stock

	Number	Weighted
	of	Average
	Shares	Fair Value
Nonvested shares at beginning of period	31,250	$	17.70
Granted	-		-
Vested	(31,250)		17.70
Forfeited	-		-
Nonvested shares 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
	March 31,
	2015		2014
Stock-based compensation within operations and maintenance expenses	$	1,078	$	1,002
Income tax benefit		439		410

Restricted Stock Units [Member]

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

Summary Of Compensation Costs

	Three Months Ended
	March 31,
	2015		2014
Stock-based compensation within operations and maintenance expenses	$	263	$	236
Income tax benefit		109		98

Stock Options [Member]

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

Summary Of Compensation Costs

	Three Months Ended
	March 31,
	2015		2014
Income tax benefit	$	104	$	73

Restricted Stock [Member]

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

Summary Of Compensation Costs

	Three Months Ended
	March 31,
	2015		2014
Stock-based compensation within operations and maintenance expenses	$	-	$	92
Income tax benefit		-		38