CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Regulated operations plant:
Gas plant	$ 10,891,910	$ 10,789,690
Less: accumulated depreciation	(3,443,053)	(3,397,736)
Construction work in progress	216,262	202,068
Net regulated operations plant	7,665,119	7,594,022
Other property and investments, net	1,313,291	1,316,479
Current assets:
Cash and cash equivalents	624,666	222,697
Accounts receivable, net of allowances	755,947	707,127
Accrued utility revenue	52,000	84,900
Income taxes receivable, net	16,937	16,816
Deferred purchased gas costs	367,954	291,145
Prepaid and other current assets	229,072	292,082
Total current assets	2,046,576	1,614,767
Noncurrent assets:
Goodwill	1,773,671	1,781,332
Deferred income taxes	44	121
Deferred charges and other assets	450,786	458,536
Total noncurrent assets	2,224,501	2,239,989
Total assets	13,249,487	12,765,257
Capitalization:
Common stock	68,479	62,052
Additional paid-in capital	2,273,837	1,824,216
Accumulated other comprehensive loss, net	(43,972)	(46,761)
Retained earnings	1,190,738	1,114,313
Total equity	3,489,082	2,953,820
Redeemable noncontrolling interests	135,984	196,717
Long-term debt, less current maturities	4,559,758	4,115,684
Total capitalization	8,184,824	7,266,221
Current liabilities:
Current maturities of long-term debt	291,069	297,324
Short-term debt	1,474,000	1,909,000
Accounts payable	256,606	353,365
Customer deposits	57,620	59,327
Income taxes payable, net	10,416	6,734
Accrued general taxes	83,897	53,473
Accrued interest	42,421	30,964
Deferred purchased gas costs	297	5,736
Other current liabilities	413,872	396,126
Total current liabilities	2,630,198	3,112,049
Deferred income taxes and other credits:
Deferred income taxes and investment tax credits, net	803,771	768,868
Accumulated removal costs	488,908	480,583
Other deferred credits and other long-term liabilities	1,141,786	1,137,536
Total deferred income taxes and other credits	2,434,465	2,386,987
Total capitalization and liabilities	$ 13,249,487	$ 12,765,257