Segment Reporting (tables)

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

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

	Three Months Ended September 30,
In thousands	Utility			Gas Storage		Other			Total
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
2012
Operating revenues	$	79,901		$	7,544	$	56		$	87,501
Depreciation and amortization	16,661			1,620		—			18,281
Income (loss) from operations	(8,439		)	3,624		19			(4,796		)
Net income (loss)	(12,174		)	1,255		40			(10,879		)
Capital expenditures	38,577			751		—			39,328

	Nine Months Ended September 30,
In thousands	Utility		Gas Storage		Other			Total
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
2012
Operating revenues	$	478,744	$	22,219	$	168		$	501,131
Depreciation and amortization	49,477		4,853		—			54,330
Income from operations	76,072		9,567		70			85,709
Net income	27,424		3,185		23			30,632
Capital expenditures	99,019		1,861		—			100,880
Total assets at September 30, 2012	2,381,659		287,687		15,802			2,685,148
Total assets at December 31, 2012	$	2,505,655	$	291,568	$	15,897		$	2,813,120

Utility Margin [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
In thousands	2013		2012		2013		2012
Utility margin calculation:
Utility operating revenues	$	80,705	$	79,901	$	474,307	$	478,744
Less: Utility cost of gas	33,655		37,570		235,156		241,823
Utility margin	$	47,050	$	42,331	$	239,151	$	236,921