CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Utility plant:
Gas plant	$ 8,742,806	$ 8,384,000
Less: accumulated depreciation	(2,499,488)	(2,419,348)
Construction work in progress	153,100	211,429
Net utility plant	6,396,418	6,176,081
Other property and investments	1,305,334	834,245
Current assets:
Cash and cash equivalents	186,690	83,352
Accounts receivable, net of allowances	692,135	522,172
Accrued utility revenue	39,700	82,400
Income taxes receivable, net	32,554	10,884
Deferred purchased gas costs	240,827	2,053
Prepaid and other current assets	200,700	170,152
Total current assets	1,392,606	871,013
Noncurrent assets:
Goodwill	791,902	345,184
Deferred income taxes	268	455
Deferred charges and other assets	483,107	508,875
Total noncurrent assets	1,275,277	854,514
Total assets	10,369,635	8,735,853
Capitalization:
Common stock	62,009	58,823
Additional paid-in capital	1,823,889	1,609,155
Accumulated other comprehensive loss, net	(55,951)	(61,003)
Retained earnings	1,079,869	1,067,978
Total equity	2,909,816	2,674,953
Redeemable noncontrolling interest	183,547	165,716
Long-term debt, less current maturities	3,573,783	2,732,200
Total capitalization	6,667,146	5,572,869
Current liabilities:
Current maturities of long-term debt	297,271	40,433
Short-term debt	272,000	107,000
Accounts payable	222,959	231,301
Customer deposits	51,816	67,920
Income taxes payable, net	27,490	12,556
Accrued general taxes	60,656	48,640
Accrued interest	38,600	20,536
Deferred purchased gas costs	0	54,636
Other current liabilities	384,442	328,945
Total current liabilities	1,355,234	911,967
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net	789,141	647,453
Accumulated removal costs	419,000	404,000
Other deferred credits and other long-term liabilities	1,139,114	1,199,564
Total deferred income taxes and other credits	2,347,255	2,251,017
Total capitalization and liabilities	10,369,635	8,735,853
Southwest Gas Corporation
Utility plant:
Gas plant	8,742,806	8,384,000
Less: accumulated depreciation	(2,499,488)	(2,419,348)
Construction work in progress	153,100	211,429
Net utility plant	6,396,418	6,176,081
Other property and investments	149,926	143,611
Current assets:
Cash and cash equivalents	122,758	41,070
Accounts receivable, net of allowances	103,430	146,861
Accrued utility revenue	39,700	82,400
Income taxes receivable, net	17,775	11,155
Deferred purchased gas costs	240,827	2,053
Prepaid and other current assets	170,470	152,748
Total current assets	694,960	436,287
Noncurrent assets:
Goodwill	10,095	10,095
Deferred charges and other assets	461,212	490,562
Total noncurrent assets	471,307	500,657
Total assets	7,712,611	7,256,636
Capitalization:
Common stock	49,112	49,112
Additional paid-in capital	1,617,796	1,410,345
Accumulated other comprehensive loss, net	(55,759)	(61,135)
Retained earnings	851,645	835,146
Total equity	2,462,794	2,233,468
Long-term debt, less current maturities	2,309,857	2,438,206
Total capitalization	4,772,651	4,671,674
Current liabilities:
Current maturities of long-term debt	275,000	0
Short-term debt	250,000	57,000
Accounts payable	113,810	161,646
Customer deposits	51,816	67,920
Accrued general taxes	60,656	48,640
Accrued interest	34,938	20,495
Deferred purchased gas costs	0	54,636
Payable to parent	207	142
Other current liabilities	155,490	146,046
Total current liabilities	941,917	556,525
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net	618,597	581,100
Accumulated removal costs	419,000	404,000
Other deferred credits and other long-term liabilities	960,446	1,043,337
Total deferred income taxes and other credits	1,998,043	2,028,437
Total capitalization and liabilities	$ 7,712,611	$ 7,256,636