Segment Reporting (Tables)

6 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

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

	Three Months Ended June 30,
In thousands	Utility		Gas Storage			Other		Total
2016
Operating revenues	$	92,135	$	6,992		$	56	$	99,183
Depreciation and amortization	18,961		1,452			—		20,413
Income from operations	9,714		2,879			13		12,606
Net income	507		1,439			73		2,019
Capital expenditures	31,295		804			—		32,099
2015
Operating revenues	$	132,891	$	5,333		$	56	$	138,280
Depreciation and amortization	18,602		1,628			—		20,230
Income from operations	12,163		739			12		12,914
Net income (loss)	2,245		(86		)	38		2,197
Capital expenditures	30,464		473			—		30,937

	Six Months Ended June 30,
In thousands	Utility		Gas Storage		Other		Total
2016
Operating revenues	$	342,239	$	12,361	$	112	$	354,712
Depreciation and amortization	37,721		3,086		—		40,807
Income from operations	82,009		4,605		64		86,678
Net income	36,359		2,175		126		38,660
Capital expenditures	60,472		1,681		—		62,153
Total assets at June 30, 2016	2,663,817		263,498		15,829		2,943,144
2015
Operating revenues	389,197		10,636		112		399,945
Depreciation and amortization	37,077		3,264		—		40,341
Income from operations	64,043		1,794		78		65,915
Net income	30,580		28		75		30,683
Capital expenditures	56,273		1,799		—		58,072
Total assets at June 30, 2015	2,638,569		270,434		14,913		2,923,916
Total assets at December 31, 2015	2,792,736		261,750		14,924		3,069,410

Utility Margin [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
In thousands	2016		2015		2016		2015
Utility margin calculation:
Utility operating revenues(1)	$	92,135	$	132,891	$	342,239	$	389,197
Less: Utility cost of gas	20,871		62,176		129,282		187,881
Environmental remediation expense	1,893		—		6,922		—
Utility margin	$	69,371	$	70,715	$	206,035	$	201,316

⁽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.