Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

	Nine Months Ended September 30,
In thousands	Utility		Gas Storage		Other		Total
2015
Operating revenues	$	476,672	$	16,232	$	169	$	493,073
Depreciation and amortization	55,798		4,885		—		60,683
Income from operations	59,955		3,998		89		64,042
Net income	23,051		827		120		23,998
Capital expenditures	84,598		2,325		—		86,923
Total assets at September 30, 2015	2,693,953		269,289		15,123		2,978,365
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
Total assets at December 31, 2014	$	2,775,011	$	273,813	$	16,121	$	3,064,945

	Three Months Ended September 30,
In thousands	Utility			Gas Storage		Other		Total
2015
Operating revenues	$	87,475		$	5,596	$	57	$	93,128
Depreciation and amortization	18,721			1,621		—		20,342
Income (loss) from operations	(4,088		)	2,204		11		(1,873		)
Net income (loss)	(7,529		)	799		45		(6,685		)
Capital expenditures	28,325			526		—		28,851
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

Schedule of Utility Margin

	Three Months Ended September 30,				Nine Months Ended September 30,
In thousands	2015		2014		2015		2014
Utility margin calculation:
Utility operating revenues	$	87,475	$	82,361	$	476,672	$	495,931
Less: Utility cost of gas	35,856		32,227		223,737		245,708
Utility margin	$	51,619	$	50,134	$	252,935	$	250,223