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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Schedule of Accounts Receivable for Services Accounts receivable for these services, which are not eliminated during consolidation, are presented in the table below:
December 31,
(Thousands of dollars)20202019
Accounts receivable for Centuri services
$13,956 $15,235 
Schedule of Revenues by Geographic Area
The following table presents the amount of revenues for both segments by geographic area:
December 31,
(Thousands of dollars)202020192018
Revenues (a)
United States$3,057,041 $2,893,201 $2,664,670 
Canada241,832 226,716 215,343 
Total$3,298,873 $3,119,917 $2,880,013 
(a)Revenues are attributed to countries based on the location of customers.
Schedule of Segment Reporting Information The financial information pertaining to the natural gas operations and utility infrastructure services segments for each of the three years in the period ended December 31, 2020 is as follows:
Year Ended December 31, 2020
(Thousands of dollars)
Natural Gas
Operations
Utility Infrastructure ServicesOtherTotal
Revenues from external customers$1,350,585 $1,813,429 $— $3,164,014 
Intersegment sales— 134,859 — 134,859 
Total$1,350,585 $1,948,288 $— $3,298,873 
Interest income$4,015 $— $— $4,015 
Interest expense$101,148 $9,269 $1,060 $111,477 
Depreciation and amortization$235,295 $96,732 $— $332,027 
Income tax expense$35,755 $31,128 $(1,130)$65,753 
Segment net income$159,118 $74,862 $(1,656)$232,324 
Segment assets$7,256,636 $1,475,237 $3,980 $8,735,853 
Capital expenditures$692,216 $132,889 $— $825,105 
Year Ended December 31, 2019
(Thousands of dollars)
Natural Gas
Operations
Utility Infrastructure ServicesOtherTotal
Revenues from external customers$1,368,939 $1,592,252 $— $2,961,191 
Intersegment sales— 158,726 — 158,726 
Total$1,368,939 $1,750,978 $— $3,119,917 
Interest income$6,356 $— $— $6,356 
Interest expense$95,026 $14,086 $114 $109,226 
Depreciation and amortization$215,620 $87,617 $— $303,237 
Income tax expense$34,973 $21,399 $(349)$56,023 
Segment net income$163,171 $52,404 $(1,639)$213,936 
Segment assets$6,798,746 $1,365,194 $6,108 $8,170,048 
Capital expenditures$778,748 $159,400 $— $938,148 
Year Ended December 31, 2018
(Thousands of dollars)
Natural Gas
Operations
Utility Infrastructure ServicesOtherTotal
Revenues from external customers$1,357,728 $1,386,371 $— $2,744,099 
Intersegment sales— 135,914 — 135,914 
Total$1,357,728 $1,522,285 $— $2,880,013 
Interest income$6,020 $88 $— $6,108 
Interest expense$81,740 $14,190 $741 $96,671 
Depreciation and amortization$191,816 $57,396 $— $249,212 
Income tax expense$43,991 $18,420 $(727)$61,684 
Segment net income$138,842 $44,977 $(1,542)$182,277 
Segment assets$6,141,584 $1,215,573 $572 $7,357,729 
Capital expenditures$682,869 $83,045 $— $765,914