Segment Reporting (tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended Three Months Ended June 30,
In thousands	Utility		Gas Storage		Other			Total
2013
Operating revenues	$	123,943	$	7,715	$	56		$	131,714
Depreciation and amortization	17,311		1,619		—			18,930
Income from operations	9,437		3,625		21			13,083
Net income	657		1,452		17			2,126
Capital expenditures	32,134		247		—			32,381
2012
Operating revenues	$	95,938	$	7,996	$	57		$	103,991
Depreciation and amortization	16,478		1,621		—			18,099
Income from operations	8,547		3,264		28			11,839
Net income (loss)	130		1,124		(27		)	1,227
Capital expenditures	40,786		319		—			41,105

	Three Months Ended Six Months Ended June 30,
In thousands	Utility		Gas Storage		Other			Total
2013
Operating revenues	$	393,602	$	15,861	$	112		$	409,575
Depreciation and amortization	34,499		3,238		—			37,737
Income from operations	79,665		7,582		42			87,289
Net income (loss)	36,688		3,088		(11		)	39,765
Capital expenditures	54,522		533		—			55,055
Total assets at June 30, 2013	2,469,320		287,341		15,928			2,772,589
2012
Operating revenues	$	398,843	$	14,675	$	112		$	413,630
Depreciation and amortization	32,816		3,233		—			36,049
Income from operations	84,511		5,943		51			90,505
Net income (loss)	39,598		1,930		(17		)	41,511
Capital expenditures	60,442		1,110		—			61,552
Total assets at June 30, 2012	2,326,919		287,622		15,909			2,630,450
Total assets at December 31, 2012	2,505,655		291,568		15,897			2,813,120

Utility Margin [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
In thousands	2013		2012		2013		2012
Utility margin calculation:
Utility operating revenues	$	123,943	$	95,938	$	393,602	$	398,843
Less: Utility cost of gas	59,142		34,498		201,501		204,253
Utility margin	$	64,801	$	61,440	$	192,101	$	194,590