STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net income	$ 98,934	$ 95,575
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	57,137	52,266
Deferred income taxes	(6,849)	18,567
Share-based compensation expense	2,695	2,587
Provision for doubtful accounts	1,338	3,754
Changes in assets and liabilities:
Accounts receivable	(154,278)	9,640
Materials and supplies	705	1,619
Natural gas in storage	100,701	49,625
Increase (Decrease) in Other Regulatory Assets	9,554	9,885
Accounts payable	(56,863)	87,202
Accrued taxes other than income	8,118	2,059
Customer deposits	(1,349)	(10,787)
IncreaseDecreaseInRegulatoryAssetsAndLiabilitiesCurrent	36,374	20,466
IncreaseDecreaseInRegulatoryAssetsAndLiabilitiesNonCurrent	66,002	(1,946,526)
Increase (Decrease) in Other Current Assets and Liabilities, Net	(12,438)	(20,698)
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	(23,037)	(14,729)
Cash provided by operating activities	107,636	(1,659,265)
Investing activities
Capital expenditures	(113,307)	(99,093)
Other	(608)	(2,351)
Proceeds from Sale of Other Assets, Investing Activities	549	241
Cash used in investing activities	(113,366)	(101,203)
Financing activities
Repayments of notes payable, net	11,165	28,775
Proceeds from Issuance of Senior Long-term Debt	0	2,498,895
Payments of Debt Issuance Costs	0	(35,110)
Proceeds from Issuance of Common Stock	34,468	0
Dividends paid	(33,285)	(30,882)
Payment, Tax Withholding, Share-based Payment Arrangement	(3,023)	(4,292)
Cash used in financing activities	9,325	2,457,386
Change in cash and cash equivalents	3,595	696,918
Cash and cash equivalents at beginning of period	8,852	7,993
Cash and cash equivalents at end of period	$ 12,447	$ 704,911