STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities
Net income	$ 131,009	$ 125,668
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	112,180	103,138
Deferred income taxes	(18,780)	24,954
Share-based compensation expense	5,699	5,679
Provision for doubtful accounts	2,511	5,496
Changes in assets and liabilities:
Accounts receivable	100,955	126,842
Materials and supplies	(7,927)	691
Natural gas in storage	(18,660)	8,198
Increase (Decrease) in Other Regulatory Assets	20,919	21,375
Accounts payable	(92,887)	13,519
Accrued taxes other than income	(8,852)	(7,710)
Customer deposits	(2,177)	(11,263)
IncreaseDecreaseInRegulatoryAssetsAndLiabilitiesCurrent	43,697	13,579
IncreaseDecreaseInRegulatoryAssetsAndLiabilitiesNonCurrent	56,135	(1,931,332)
Increase (Decrease) in Other Current Assets and Liabilities, Net	8,234	(14,300)
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	(3,541)	(19,132)
Cash provided by operating activities	286,677	(1,577,348)
Investing activities
Capital expenditures	(251,060)	(217,039)
Payments for (Proceeds from) Other Investing Activities	(1,332)	(2,821)
Proceeds from Sale of Other Assets, Investing Activities	891	716
Cash used in investing activities	(251,501)	(219,144)
Financing activities
Borrowings (repayments) of short-term debt, net	(3,900)	(418,225)
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	37,104	18,122
Dividends paid	(66,821)	(61,785)
Payment, Tax Withholding, Share-based Payment Arrangement	(3,026)	(4,328)
Cash used in financing activities	(36,643)	1,997,569
Change in cash and cash equivalents	(1,467)	201,077
Cash and cash equivalents at beginning of period	8,852	7,993
Cash and cash equivalents at end of period	$ 7,385	$ 209,070