Segment Information (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

The following table presents summary financial information concerning the reportable segments of continued operations. See Note 18 for information regarding discontinued operations for NW Holdings and NW Natural.

In thousands	NGD		Other (NW Natural)		NW Natural		Other (NW Holdings)			NW Holdings
2018
Operating revenues	$	680,648	$	24,923	$	705,571	$	572		$	706,143
Depreciation and amortization	83,732		1,254		84,986		170			85,156
Income (loss) from operations	118,095		15,004		133,099		(937		)	132,162
Net income (loss) from continuing operations	57,491		10,558		68,049		(738		)	67,311
Capital expenditures	212,323		2,005		214,328		308			214,636
Total assets at December 31, 2018(2)	3,141,969		50,767		3,192,736		36,657			3,229,393
2017
Operating revenues	$	732,942	$	22,096	$	755,038	$	—		$	755,038
Depreciation and amortization	79,734		1,290		81,024		29			81,053
Income (loss) from operations	138,450		12,472		150,922		(20		)	150,902
Net income from continuing operations(1)	60,509		11,211		71,720		353			72,073
Capital expenditures	211,672		1,653		213,325		—			213,325
Total assets at December 31, 2017(2)	2,961,326		50,471		3,011,797		14,075			3,025,872
2016
Operating revenues	$	650,477	$	17,472	$	667,949	$	224		$	668,173
Depreciation and amortization	76,289		1,286		77,575		29			77,604
Income (loss) from operations	137,178		14,109		151,287		(570		)	150,717
Net income (loss) from continuing operations(3)	54,567		8,268		62,835		(416		)	62,419
Capital expenditures	138,074		283		138,357		—			138,357
Total assets at December 31, 2016(2)	2,806,627		48,719		2,855,346		14,040			2,869,386

⁽¹⁾ Includes $1.0 million of tax expense in NGD, $4.0 million of tax benefit in Other (NW Natural), and $0.4 million of tax benefit in Other (NW Holdings) from the TCJA remeasurement for the year ended December 31, 2017.

⁽²⁾  Total assets for NW Holdings exclude assets related to discontinued operations of $13.3 million, $13.9 million and $210.4 million as of December 31, 2018, 2017, and 2016, respectively. Total assets for NW Natural exclude assets related to discontinued operations of $31.9 million and $226.1 million as of December 31, 2017, and 2016, respectively.

⁽³⁾  Includes $2.0 million in 2016 of after-tax regulatory environmental disallowance charges in NGD.

Utility Margin

The following table presents additional segment information concerning NGD margin:

In thousands	2018		2017		2016
NGD margin calculation:
NGD operating revenues	$	680,648	$	732,942	$	650,477
Less: NGD cost of gas	255,743		325,019		260,588
Environmental remediation expense	11,127		15,291		13,298
Revenue taxes(1)	30,082		—		—
NGD margin	$	383,696	$	392,632	$	376,591

⁽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 NGD margin results as revenue taxes were previously presented net in NGD operating revenue. For additional information, see Note 2.