Income Tax (tables)

12 Months Ended

Dec. 31, 2012

Income Tax Expense (Benefit) [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Dollars in thousands	2012			2011			2010
Income taxes at federal statutory rate	$	36,386		$	37,550		$	42,745
Increase (decrease):
Current state income tax, net of federal tax benefit	4,773			4,945			5,803
Amortization of investment and energy tax credits	(350		)	(442		)	(525		)
Differences required to be flowed-through by regulatory commissions	1,718			1,647			1,647
Gains on company and trust-owned life insurance	(800		)	(786		)	(715		)
Regulatory asset impairment	2,700			—			—
Other, net	(323		)	468			507
Total provision for income taxes	$	44,104		$	43,382		$	49,462
Effective tax rate	42.4		%	40.4		%	40.5		%

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

In thousands	2012		2011			2010
Current
Federal	$	1,693	$	130		$	(28,592	)
State	99		(929		)	1,441
	1,792		(799		)	(27,151		)
Deferred
Federal	31,767		35,481			69,159
State	10,545		8,700			7,454
	42,312		44,181			76,613
Total provision for income taxes	$	44,104	$	43,382		$	49,462
Total income taxes paid	$	2,979	$	1,756		$	22,600

Schedule Of Regulated Utility And Non Utility Business Segments [Table Text Block]

In thousands	2012			2011			2010
Regulated utility:
Current	$	1,909		$	(4,646	)	$	(1,464	)
Deferred	39,864			50,152			47,741
Deferred investment and energy tax credits	(350		)	(422		)	(525		)
	41,423			45,084			45,752
Non-utility business segments:
Current	(117		)	3,846			(25,687		)
Deferred	2,798			(5,548		)	29,397
	2,681			(1,702		)	3,710
Total provision for income taxes	$	44,104		$	43,382		$	49,462

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

In thousands	2012			2011
Deferred tax liabilities:
Plant and property	$	322,527		$	292,235
Regulatory adjustment for income taxes paid	—			2,106
Regulatory income tax assets	60,253			65,755
Regulatory liabilities	51,424			35,638
Non-regulated deferred tax liabilities	43,824			43,373
Total	$	478,028		$	439,107
Deferred tax assets:
Regulatory assets	$	(7,724	)	$	4,727
Unfunded pension and postretirement obligations	6,024			5,119
Non-regulated deferred tax assets	(1,235		)	1,161
Alternative minimum tax credit carryforward	1,986			1,626
Loss and credit carryforwards	32,997			14,255
Total	32,048			26,888
Deferred income tax liabilities, net	445,980			412,219
Deferred investment tax credits	624			990
Deferred income taxes and investment tax credits	$	446,604		$	413,209