Segment Information (Tables)

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Accounts Receivable for Services

Accounts receivable for these services, which are not eliminated during consolidation, are presented in the table below:

(Thousands of dollars)	September 30, 2020		December 31, 2019
Centuri accounts receivable for services provided to Southwest	$	15,102	$	15,235

Schedule of Segment Reporting Information

The financial information pertaining to the natural gas operations and utility infrastructure services segments is as follows:

(Thousands of dollars)	Natural Gas Operations		Utility Infrastructure Services		Other		Total
Three Months Ended September 30, 2020
Revenues from external customers	$	210,834	$	548,300	$	—	$	759,134
Intersegment revenues	—		32,092		—		32,092
Total	$	210,834	$	580,392	$	—	$	791,226
Segment net income (loss)	$	(15,973)	$	34,873	$	(627)	$	18,273
Three Months Ended September 30, 2019
Revenues from external customers	$	209,980	$	480,896	$	—	$	690,876
Intersegment revenues	—		34,354		—		34,354
Total	$	209,980	$	515,250	$	—	$	725,230
Segment net income (loss)	$	(20,012)	$	25,838	$	(473)	$	5,353
(Thousands of dollars)	Natural Gas Operations		Utility Infrastructure Services		Other		Total
Nine Months Ended September 30, 2020
Revenues from external customers	$	976,095	$	1,306,481	$	—	$	2,282,576
Intersegment revenues	—		102,217		—		102,217
Total	$	976,095	$	1,408,698	$	—	$	2,384,793
Segment net income (loss)	$	79,568	$	50,936	$	(1,724)	$	128,780
Nine Months Ended September 30, 2019
Revenues from external customers	$	989,368	$	1,160,303	$	—	$	2,149,671
Intersegment revenues	—		122,109		—		122,109
Total	$	989,368	$	1,282,412	$	—	$	2,271,780
Segment net income (loss)	$	86,746	$	36,725	$	(1,253)	$	122,218

(Thousands of dollars)	Natural Gas Operations		Utility Infrastructure Services		Other		Total
Twelve Months Ended September 30, 2020
Revenues from external customers	$	1,355,666	$	1,738,430	$	—	$	3,094,096
Intersegment revenues	—		138,834		—		138,834
Total	$	1,355,666	$	1,877,264	$	—	$	3,232,930
Segment net income (loss)	$	155,993	$	66,615	$	(2,110)	$	220,498
Twelve Months Ended September 30, 2019
Revenues from external customers	$	1,359,581	$	1,537,508	$	—	$	2,897,089
Intersegment revenues	—		161,345		—		161,345
Total	$	1,359,581	$	1,698,853	$	—	$	3,058,434
Segment net income (loss)	$	146,287	$	46,668	$	(1,433)	$	191,522