CONDENSED CONSOLIDATED BALANCE SHEETS - Southwest - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Regulated operations plant:
Gas plant	$ 10,253,377	$ 10,140,362
Less: accumulated depreciation	(2,863,941)	(2,822,669)
Construction work in progress	245,032	200,549
Net regulated operations plant	7,634,468	7,518,242
Other property and investments, net	1,252,861	1,266,340
Current assets:
Cash and cash equivalents	457,952	106,536
Accounts receivable, net of allowance	843,133	886,549
Accrued utility revenue	58,500	93,000
Income taxes receivable, net	7,174	1,935
Deferred purchased gas costs	198,682	552,885
Prepaid and other current assets	214,516	218,832
Current assets held for sale	0	21,377
Total current assets	1,779,957	1,881,114
Noncurrent assets:
Goodwill	787,206	789,729
Deferred charges and other assets	432,193	414,008
Total noncurrent assets	1,220,708	1,204,200
Total assets	11,887,994	11,869,896
Capitalization:
Common stock	73,295	73,194
Additional paid-in capital	2,547,485	2,541,790
Accumulated other comprehensive loss, net	(46,222)	(43,787)
Retained earnings	781,683	738,839
Total equity	3,356,241	3,310,036
Long-term debt, less current maturities	4,648,958	4,609,838
Total capitalization	8,012,860	8,024,541
Current liabilities:
Accounts payable	264,620	346,907
Customer deposits	52,632	48,460
Accrued general taxes	96,676	58,053
Accrued interest	39,985	36,605
Other current liabilities	577,237	522,953
Total current liabilities	1,718,664	1,684,847
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net	784,491	752,997
Accumulated removal costs	457,000	458,000
Other deferred credits and other long-term liabilities	914,979	949,511
Total deferred income taxes and other credits	2,156,470	2,160,508
Total capitalization and liabilities	11,887,994	11,869,896
Southwest Gas Corporation
Regulated operations plant:
Gas plant	10,253,377	10,140,362
Less: accumulated depreciation	(2,863,941)	(2,822,669)
Construction work in progress	245,032	200,549
Net regulated operations plant	7,634,468	7,518,242
Other property and investments, net	156,262	152,658
Current assets:
Cash and cash equivalents	436,403	71,154
Accounts receivable, net of allowance	297,488	269,195
Accrued utility revenue	58,500	93,000
Income taxes receivable, net	28	26
Deferred purchased gas costs	198,682	552,885
Prepaid and other current assets	187,146	188,138
Current assets held for sale	0	21,376
Total current assets	1,178,247	1,195,774
Noncurrent assets:
Goodwill	11,155	11,155
Deferred charges and other assets	390,333	390,742
Total noncurrent assets	401,488	401,897
Total assets	9,370,465	9,268,571
Capitalization:
Common stock	49,112	49,112
Additional paid-in capital	2,156,318	2,156,577
Accumulated other comprehensive loss, net	(40,164)	(40,548)
Retained earnings	1,112,273	1,018,474
Total equity	3,277,539	3,183,615
Long-term debt, less current maturities	3,502,411	3,501,543
Total capitalization	6,779,950	6,685,158
Current liabilities:
Customer deposits	52,631	48,460
Accrued general taxes	96,676	58,053
Accrued interest	38,340	34,955
Other current liabilities	300,865	271,899
Total current liabilities	627,719	630,822
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net	790,312	749,836
Accumulated removal costs	457,000	458,000
Other deferred credits and other long-term liabilities	715,484	744,755
Total deferred income taxes and other credits	1,962,796	1,952,591
Total capitalization and liabilities	9,370,465	9,268,571
Southwest Gas Corporation | Nonrelated Party
Current liabilities:
Accounts payable	138,938	215,744
Southwest Gas Corporation | Related Party
Current liabilities:
Accounts payable	$ 269	$ 1,711