Segment Reporting (tables)

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

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

	Nine Months Ended September 30,
In thousands	Utility		Gas Storage		Other			Total
2014
Operating revenues	$	495,931	$	17,655	$	168		$	513,754
Depreciation and amortization	54,333		4,903		—			59,236
Income from operations	78,971		3,994		252			83,217
Net income	29,416		472		334			30,222
Capital expenditures	85,793		759		—			86,552
Total assets at September 30, 2014	2,539,834		277,689		16,001			2,833,524
2013
Operating revenues	$	474,307	$	23,295	$	168		$	497,770
Depreciation and amortization	51,617		4,857		—			56,474
Income (loss) from operations	72,372		11,138		(8		)	83,502
Net income (loss)	27,083		4,495		(46		)	31,532
Capital expenditures	85,327		960		—			86,287
Total assets at September 30, 2013	2,502,688		287,317		15,908			2,805,913
Total assets at December 31, 2013	2,644,367		310,097		16,447			2,970,911

	Three Months Ended September 30,
In thousands	Utility			Gas Storage		Other			Total
2014
Operating revenues	$	82,361		$	4,782	$	56		$	87,199
Depreciation and amortization	18,279			1,659		—			19,938
Income (loss) from operations	(6,221		)	926		218			(5,077		)
Net income (loss)	(8,808		)	2		73			(8,733		)
Capital expenditures	33,717			346		—			34,063
2013
Operating revenues	$	80,705		$	7,434	$	56		$	88,195
Depreciation and amortization	17,118			1,619		—			18,737
Income (loss) from operations	(7,293		)	3,556		(50		)	(3,787		)
Net income (loss)	(9,605		)	1,407		(35		)	(8,233		)
Capital expenditures	30,805			427		—			31,232

Utility Margin [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
In thousands	2014		2013		2014		2013
Utility margin calculation:
Utility operating revenues	$	82,361	$	80,705	$	495,931	$	474,307
Less: Utility cost of gas	32,227		33,655		245,708		235,156
Utility margin	$	50,134	$	47,050	$	250,223	$	239,151