Segment Information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

Note 4 – Segment Information

The Company has two reportable segments: natural gas operations and construction services. Southwest has a single reportable segment that is referred to herein as the natural gas operations segment of the Company. In order to reconcile to net income as disclosed in the Condensed Consolidated Statements of Income, an Other column is included associated with impacts related to corporate and administrative activities related to Southwest Gas Holdings, Inc. The following tables present revenues from external customers, intersegment revenues, and segment net income for the two reportable segments (thousands of dollars):

	Natural Gas Operations		Construction Services			Other			Total
Three months ended March 31, 2018
Revenues from external customers	$	494,313	$	232,859		$	—		$	727,172
Intersegment revenues		—		27,158			—			27,158
Total	$	494,313	$	260,017		$	—		$	754,330
Segment net income (loss)	$	90,349	$	(11,001	)	$	(257	)	$	79,091
Three months ended March 31, 2017
Revenues from external customers	$	462,602	$	170,839		$	—		$	633,441
Intersegment revenues		—		21,296			—			21,296
Total	$	462,602	$	192,135		$	—		$	654,737
Segment net income (loss)	$	76,938	$	(7,334	)	$	(296	)	$	69,308
	Natural Gas Operations		Construction Services			Other			Total
Twelve months ended March 31, 2018
Revenues from external customers	$	1,334,019	$	1,211,345		$	—		$	2,545,364
Intersegment revenues		—		103,021			—			103,021
Total	$	1,334,019	$	1,314,366		$	—		$	2,648,385
Segment net income (loss)	$	170,229	$	34,693		$	(1,298	)	$	203,624
Twelve months ended March 31, 2017
Revenues from external customers	$	1,258,914	$	1,027,835		$	—		$	2,286,749
Intersegment revenues		—		97,230			—			97,230
Total	$	1,258,914	$	1,125,065		$	—		$	2,383,979
Segment net income (loss)	$	118,778	$	27,421		$	(296	)	$	145,903