Revenue (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Summary of Revenue Disaggregated by Service Type and Contract Type

Gas operating revenues on the Condensed Consolidated Statements of Income of both the Company and Southwest include revenue from contracts with customers, which is shown below, disaggregated by customer type, and various categories of revenue:

	Three Months Ended						Twelve Months Ended
	March 31,						March 31,
(Thousands of dollars)	2019			2018			2019			2018
Residential	$	417,228		$	344,611		$	959,837		$	859,078
Small commercial	89,610			87,943			256,750			250,331
Large commercial	13,962			15,440			51,714			54,224
Industrial/other	6,478			6,510			23,457			23,085
Transportation	24,902			24,054			87,838			89,081
Revenue from contracts with customers	552,180			478,558			1,379,596			1,275,799
Alternative revenue program revenues (deferrals)	(34,545		)	27,209			(15,775		)	66,788
Other revenues (a)	3,042			(11,454		)	20,271			(8,568		)
Total Gas operating revenues	$	520,677		$	494,313		$	1,384,092		$	1,334,019

(a)

Includes various other revenues which, in the periods presented ending March 31, 2018, were offset by a $14 million reserve against revenue associated with a tax reform savings adjustment. The following tables display Centuri’s revenue, reflected as Utility infrastructure services revenues on the Condensed Consolidated Statements of Income of the Company, representing revenue from contracts with customers disaggregated by service and contract types:

(Thousands of dollars)	Three Months Ended				Twelve Months Ended
	March 31,				March 31,
	2019		2018		2019		2018
Service Types:
Gas infrastructure services	$	197,893	$	193,527	$	1,128,048	$	938,342
Electric power infrastructure services	52,301		5,402		79,528		19,893
Other	62,668		61,088		367,554		356,131
Total Utility infrastructure services revenues	$	312,862	$	260,017	$	1,575,130	$	1,314,366

(Thousands of dollars)	Three Months Ended				Twelve Months Ended
	March 31,				March 31,
	2019		2018		2019		2018
Contract Types:
Master services agreement	$	235,655	$	194,464	$	1,143,603	$	932,804
Bid contract	77,207		65,553		431,527		381,562
Total Utility infrastructure services revenues	$	312,862	$	260,017	$	1,575,130	$	1,314,366
Unit priced contracts	$	235,686	$	197,322	$	1,296,783	$	1,013,642
Fixed priced contracts	38,538		25,541		130,295		137,724
Time and materials contracts	38,638		37,154		148,052		163,000
Total Utility infrastructure services revenues	$	312,862	$	260,017	$	1,575,130	$	1,314,366

Summary of Information about Receivables, Revenue Earned on Contracts in Progress in Excess of Billings, Which are Included Within Accounts Receivable, Net of Allowances, and Amounts Billed in Excess of Revenue Earned on Contracts

The following table provides information about contracts receivable and revenue earned on contracts in progress in excess of billings (contract asset), which are both included within Accounts receivable, net of allowances, as well as amounts billed in excess

of revenue earned on contracts (contract liability), which are included in Other current liabilities as of March 31, 2019 and December 31, 2018 on the Company’s Condensed Consolidated Balance Sheets:

(Thousands of dollars)	March 31, 2019		December 31, 2018
Contracts receivable, net	$	160,973	$	186,249
Revenue earned on contracts in progress in excess of billings	97,642		87,520
Amounts billed in excess of revenue earned on contracts	4,588		4,211

Schedule of Construction Services Contracts Receivable

Utility infrastructure services contracts receivable consists of the following:

(Thousands of dollars)	March 31, 2019			December 31, 2018
Billed on completed contracts and contracts in progress	$	159,829		$	184,100
Other receivables	1,527			2,588
Contracts receivable, gross	161,356			186,688
Allowance for doubtful accounts	(383		)	(439		)
Contracts receivable, net	$	160,973		$	186,249