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Stock-Based Compensation (tables)

12 Months Ended

Dec. 31, 2013

Share-based Compensation [Abstract]

Schedule of Share-based Payment Awards [Table Text Block]



Expense in millions		Shares⁽¹⁾			Expense During Award Year⁽³⁾				Total Expense for Award
Estimated award:
2011-2013 grant⁽²⁾		9,516			$	0.4			$	1.0
Actual award:
2010-2012 grant		9,924			0.5				1.2
2009-2011 grant		8,428			0.4				0.8

Schedule Of Performance Based Award [Table Text Block]



Dollars in thousands		Performance Share Awards Outstanding						2013				Cumulative Expense
Performance Period		Target			Maximum			Expense				December 31, 2013
2011-13		37,950			75,900			$	390			$	960
2012-14		35,340			70,680			603				1,238
2013-15		37,300			74,600			486				486
Total		110,590			221,180			$	1,479

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]



		Number of RSUs			Weighted - Average Price Per RSU
Nonvested, Dec. 31, 2011		—			$	—
Granted		25,224			47.58
Vested		—			—
Forfeited		(360	)		48.00
Nonvested, Dec. 31, 2012		24,864			47.57
Granted		25,748			45.38
Vested		(5,455	)		48.01
Forfeited		(590	)		46.58
Nonvested, Dec. 31, 2013		44,567			46.27

SOP Assumptions [Table Text Block]



		2011
Risk-free interest rate		2.0		%
Expected life (in years)		4.5
Expected market price volatility factor		24.5		%
Expected dividend yield		3.8		%
Forfeiture rate		3.1		%
Weighted average grant date fair value		$	6.73

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]



		Option Shares			Weighted - Average Price Per Share				Intrinsic Value (In millions)
Balance outstanding, Dec. 31, 2010		490,460			$	40.82			$	2.8
Granted		122,700			45.74				n/a
Exercised		(24,185	)		33.88				0.3
Forfeited		(9,750	)		44.38				n/a
Balance outstanding, Dec. 31, 2011		579,225			42.09				3.4
Exercised		(46,825	)		40.62				0.4
Forfeited		(2,475	)		43.78				n/a
Balance outstanding, Dec. 31, 2012		529,925			42.22				1.3
Exercised		(33,800	)		32.16				0.3
Forfeited		(3,975	)		43.72				n/a
Balance outstanding, Dec. 31, 2013		492,150			42.89				0.6
Exercisable, Dec. 31, 2013		409,036			42.41				0.6

Schedule Of Stock Based Compensation Capitalized Under LTIP SOP and ESPP [Table Text Block]



In thousands		2013			2012			2011
Operations and maintenance expense, for stock-based compensation		$	1,876		$	1,668		$	1,477
Income tax benefit		(765		)	(707		)	(597		)
Net stock-based compensation effect on net income		$	1,111		$	961		$	880
Amounts capitalized for stock-based compensation		$	331		$	294		$	261