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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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



Dollars in thousands		Shares⁽¹⁾			Expense During Award Year⁽²⁾				Total Expense for Award
Estimated award:
2013-2015 grant⁽³⁾		8,465			$	312			$	1,240
Actual award:
2012-2014 grant		8,621			582				1,821
2011-2013 grant		9,819			390				960

Schedule Of Performance Based Award [Table Text Block]



Dollars in thousands		Performance Share Awards Outstanding						2015				Cumulative Expense
Performance Period		Target			Maximum			Expense				December 31, 2015
2013-15		34,100			68,200			$	312			$	1,240
2014-16		39,725			79,450			632				1,250
2015-17		43,950			87,900			853				853
Total		117,775			235,550			$	1,797

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



		Number of RSUs			Weighted - Average Price Per RSU
Nonvested, December 31, 2012		24,864			$	47.57
Granted		25,748			45.38
Vested		(5,455	)		48.01
Forfeited		(590	)		46.58
Nonvested, December 31, 2013		44,567			46.27
Granted		38,765			42.19
Vested		(12,060	)		46.52
Forfeited		(478	)		45.47
Nonvested, December 31, 2014		70,794			44.00
Granted		37,264			46.29
Vested		(19,003	)		44.81
Forfeited		(468	)		44.99
Nonvested, December 31, 2015		88,587			44.78

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



		Option Shares			Weighted - Average Price Per Share				Intrinsic Value (In millions)
Balance outstanding, December 31, 2012		529,925			$	42.22			$	1.3
Exercised		(33,800	)		32.16				0.3
Forfeited		(3,975	)		43.72				n/a
Balance outstanding, December 31, 2013		492,150			42.89				0.6
Exercised		(69,662	)		39.82				0.5
Forfeited		(6,400	)		43.59				n/a
Balance outstanding, December 31, 2014		416,088			43.40				2.7
Exercised		(62,900	)		39.96				0.5
Forfeited		(500	)		45.74				n/a
Balance outstanding and exercisable, December 31, 2015		352,688			44.00				2.3

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



In thousands		2015			2014			2013
Operations and maintenance expense, for stock-based compensation		$	2,673		$	2,309		$	1,876
Income tax benefit		(1,012		)	(861		)	(765		)
Net stock-based compensation effect on net income		$	1,661		$	1,448		$	1,111
Amounts capitalized for stock-based compensation		$	661		$	597		$	331