Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2016

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
2016
Operating revenues	$	80,378		$	7,293	$	56		$	87,727
Depreciation and amortization	19,173			1,455		—			20,628
Income (loss) from operations	(7,264		)	3,502		(675		)	(4,437		)
Net income (loss)	(9,511		)	1,813		(342		)	(8,040		)
Capital expenditures	36,238			437		—			36,675
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

	Nine Months Ended September 30,
In thousands	Utility		Gas Storage		Other			Total
2016
Operating revenues	$	422,617	$	19,654	$	168		$	442,439
Depreciation and amortization	56,894		4,541		—			61,435
Income (loss) from operations	74,745		8,107		(611		)	82,241
Net income (loss)	26,848		3,988		(216		)	30,620
Capital expenditures	96,710		1,401		—			98,111
Total assets at September 30, 2016	2,684,618		259,483		15,783			2,959,884
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	2,686,367		269,228		15,123			2,970,718
Total assets at December 31, 2015	2,792,736		261,750		14,924			3,069,410

Utility Margin [Table Text Block]

	Three Months Ended September 30,				Nine Months Ended September 30,
In thousands	2016		2015		2016		2015
Utility margin calculation:
Utility operating revenues(1)	$	80,378	$	87,475	$	422,617	$	476,672
Less: Utility cost of gas	28,264		35,856		157,546		223,737
Environmental remediation expense	1,191		—		8,113		—
Utility margin	$	50,923	$	51,619	$	256,958	$	252,935

⁽¹⁾   Utility operating revenues include environmental recovery revenues, which are collections received from customers through our environmental recovery mechanism in Oregon, offset by environmental remediation expense. Collections under this mechanism began in November 2015.