Revenue (Tables)

3 Months Ended

Mar. 31, 2020

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 March 31,						Twelve Months Ended March 31,
(Thousands of dollars)	2020			2019			2020		2019
Residential	$	378,555		$	417,228		$	934,115	$	959,837
Small commercial	82,463			89,610			241,970		256,750
Large commercial	12,667			13,962			47,640		51,714
Industrial/other	6,702			6,478			22,298		23,457
Transportation	24,406			24,902			91,884		87,838
Revenue from contracts with customers	504,793			552,180			1,337,907		1,379,596
Alternative revenue program revenues (deferrals)	(3,765		)	(34,545		)	5,668		(15,775		)
Other revenues	1,799			3,042			7,514		20,271
Total Gas operating revenues	$	502,827		$	520,677		$	1,351,089	$	1,384,092

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:

	Three Months Ended March 31,				Twelve Months Ended March 31,
(Thousands of dollars)	2020		2019		2020		2019
Service Types:
Gas infrastructure services	$	217,709	$	197,893	$	1,258,790	$	1,128,048
Electric power infrastructure services	72,320		52,301		267,736		79,528
Other	43,464		62,668		245,083		367,554
Total Utility infrastructure services revenues	$	333,493	$	312,862	$	1,771,609	$	1,575,130

	Three Months Ended March 31,				Twelve Months Ended March 31,
(Thousands of dollars)	2020		2019		2020		2019
Contract Types:
Master services agreement	$	263,545	$	235,655	$	1,411,267	$	1,143,603
Bid contract	69,948		77,207		360,342		431,527
Total Utility infrastructure services revenues	$	333,493	$	312,862	$	1,771,609	$	1,575,130
Unit price contracts	$	243,136	$	235,686	$	1,387,706	$	1,296,783
Fixed price contracts	27,545		38,538		101,931		130,295
Time and materials contracts	62,812		38,638		281,972		148,052
Total Utility infrastructure services revenues	$	333,493	$	312,862	$	1,771,609	$	1,575,130

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, 2020 and December 31, 2019 on the Company’s Condensed Consolidated Balance Sheets:

(Thousands of dollars)	March 31, 2020		December 31, 2019
Contracts receivable, net	$	174,228	$	223,904
Revenue earned on contracts in progress in excess of billings	99,967		99,399
Amounts billed in excess of revenue earned on contracts	4,716		4,525

Schedule of Construction Services Contracts Receivable

Utility infrastructure services contracts receivable consists of the following:

(Thousands of dollars)	March 31, 2020			December 31, 2019
Billed on completed contracts and contracts in progress	$	169,023		$	216,268
Other receivables	5,644			8,456
Contracts receivable, gross	174,667			224,724
Allowance for doubtful accounts	(439		)	(820		)
Contracts receivable, net	$	174,228		$	223,904