Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following table presents summary financial information concerning the reportable segments:

	Three Months Ended March 31,
In thousands	Utility		Gas Storage		Other			Total
2018
Operating revenues	$	257,933	$	5,233	$	1,546		$	264,712
Depreciation and amortization	20,543		442		—			20,985
Income (loss) from operations	64,756		3,036		(444		)	67,348
Net income (loss)	39,883		1,898		(244		)	41,537
Capital expenditures	56,894		537		—			57,431
Total assets at March 31, 2018	2,951,918		58,676		18,745			3,029,339
2017
Operating revenues	$	292,726	$	4,541	$	56		$	297,323
Depreciation and amortization	19,624		1,461		—			21,085
Income from operations	77,127		606		(201		)	77,532
Net income	40,192		61		57			40,310
Capital expenditures	38,854		70		—			38,924
Total assets at March 31, 2017	2,799,638		254,260		16,758			3,070,656
Total assets at December 31, 2017	2,961,326		59,583		18,837			3,039,746

Utility Margin

The following table presents additional segment information concerning utility margin:

	Three Months Ended March 31,
In thousands	2018		2017
Utility margin calculation:
Utility operating revenues	$	257,933	$	292,726
Less: Utility cost of gas	108,164		143,611
Environmental remediation expense	4,624		6,954
Revenue taxes(1)	12,429		—
Utility margin	$	132,716	$	142,161

⁽¹⁾  The change in presentation of revenue taxes was a result of the adoption of ASU 2014-09 "Revenue From Contracts with Customers" and all related amendments on January 1, 2018. This change had no impact on utility margin results as revenue taxes were previously presented net in utility operating revenue. For additional information, see Note 2.