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Regulated Operations Plant and Leases (Tables)
 12 Months Ended
Dec. 31, 2021
Regulated Operations [Abstract]  
Schedule of Net Utility Plant
Major classes of regulated operations plant and their respective balances as of December 31, 2021 and 2020 were as follows:
December 31,December 31,
(Thousands of dollars)2021202020212020
Southwest Gas Holdings, Inc.*Southwest Gas Corporation
Gas plant:
Storage$437,793 $101,203 $103,874 $101,203 
Transmission1,917,529 400,657 397,590 400,657 
Distribution7,506,489 7,078,656 7,506,489 7,078,656 
General530,346 515,879 496,643 515,879 
Software and software-related intangibles380,372 270,883 380,372 270,883 
Other17,161 16,722 16,607 16,722 
10,789,690 8,384,000 8,901,575 8,384,000 
Less: accumulated depreciation and amortization(3,397,736)(2,419,348)(2,538,508)(2,419,348)
Construction work in progress202,068 211,429 183,485 211,429 
Net regulated operations plant$7,594,022 $6,176,081 $6,546,552 $6,176,081 
*Southwest Gas Holdings, Inc. includes the regulated operations plant associated with the Questar Pipelines acquisition.
Schedule of Depreciation and Amortization Expense
Depreciation and amortization expense on gas plant, including intangibles, was as follows:
(Thousands of dollars)202120202019
Depreciation and amortization expense$230,245 $215,636 $197,358 
Schedule of Components of Lease Expense, and Supplemental Cash Flow Information Related to Leases
The components of lease expense were as follows:
(Thousands of dollars)202120202019
Southwest:
Operating lease cost
$1,021 $1,251 $1,531 
Centuri:
Operating lease cost
15,279 14,294 12,235 
Finance lease cost:
Amortization of ROU assets
2,138 140 137 
Interest on lease liabilities
278 37 34 
Total finance lease cost
2,416 177 171 
Short-term lease cost
103,800 19,806 16,217 
Total lease cost - Southwest Gas Holdings, Inc.$122,516 $35,528 $30,154 
Supplemental cash flow information related to leases for the years ended December 31, 2021, 2020 and 2019 was as follows:
2021
(Thousands of dollars)SouthwestCenturiTotal
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$744 $14,669 $15,413 
Operating cash flows from finance leases— 278 278 
Financing cash flows from finance leases— 3,547 3,547 
ROU assets obtained in exchange for lease obligations:
Operating leases$609 $11,597 $12,206 
Finance leases— 3,332 3,332 
2020
(Thousands of dollars)SouthwestCenturiTotal
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$766 $12,889 $13,655 
Operating cash flows from finance leases— 3636 
Financing cash flows from finance leases— 199199 
ROU assets obtained in exchange for lease obligations:
Operating leases$1,547 $19,372 $20,919 
Finance leases— 361 361 
2019
(Thousands of dollars)SouthwestCenturiTotal
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases$1,278 $11,166 $12,444 
Operating cash flows from finance leases— 3333 
Financing cash flows from finance leases— 212212 
ROU assets obtained in exchange for lease obligations:
Operating leases$862 $23,825 $24,687 
Finance leases— 13,839 13,839 
Schedule of Supplemental Information Related to Leases Included in Balance Sheet
Supplemental information related to leases, including location in the Consolidated Balance Sheets, is as follows:
(Thousands of dollars)December 31,
20212020
Southwest:
Operating leases:
Net regulated operations plant$2,072 $2,195 
Other current liabilities
$607 $656 
Other deferred credits and other long-term liabilities
1,500 1,586 
Total operating lease liabilities$2,107 $2,242 
Weighted average remaining lease term (in years)4.224.24
Weighted average discount rate4.90 %4.49 %
Centuri:
Operating leases:
Other property and investments
$80,638 $81,010 
Other current liabilities
$12,185 $10,032 
Other deferred credits and other long-term liabilities
72,930 75,247 
Total operating lease liabilities$85,115 $85,279 
Finance leases:
Other property and investments
$30,705 $752 
Other current liabilities
$8,858 $202 
Other deferred credits and other long-term liabilities
20,585 490 
Total finance lease liabilities$29,443 $692 
Weighted average remaining lease term (in years)
Operating leases
7.5710.08
Finance leases
3.922.12
Weighted average discount rate
Operating leases
3.95 %4.05 %
Finance leases
2.58 %5.55 %
Schedule of Maturities of Operating Lease Liabilities
The following are schedules of maturities of lease liabilities as of December 31, 2021:
(Thousands of dollars)Operating Leases
Southwest:
2022$639 
2023522 
2024499 
2025483 
2026220 
Thereafter— 
Total lease payments
2,363 
Less imputed interest256 
Total
$2,107 
(Thousands of dollars)Operating LeasesFinance Leases
Centuri:
2022$15,200 $9,494 
202313,402 7,940 
202411,321 6,476 
20259,228 3,987 
20267,878 2,108 
Thereafter45,529 1,008 
Total lease payments
102,558 31,013 
Less imputed interest17,443 1,570 
Total
$85,115 $29,443 
Schedule of Maturities of Finance Lease Liabilities
The following are schedules of maturities of lease liabilities as of December 31, 2021:
(Thousands of dollars)Operating Leases
Southwest:
2022$639 
2023522 
2024499 
2025483 
2026220 
Thereafter— 
Total lease payments
2,363 
Less imputed interest256 
Total
$2,107 
(Thousands of dollars)Operating LeasesFinance Leases
Centuri:
2022$15,200 $9,494 
202313,402 7,940 
202411,321 6,476 
20259,228 3,987 
20267,878 2,108 
Thereafter45,529 1,008 
Total lease payments
102,558 31,013 
Less imputed interest17,443 1,570 
Total
$85,115 $29,443