STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating activities
Net income	$ 119,419	$ 99,317
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	81,704	76,572
Deferred income taxes	19,146	16,247
Share-based compensation expense	3,656	3,117
Provision for doubtful accounts	2,331	1,675
Changes in assets and liabilities:
Accounts receivable	(40,690)	21,684
Materials and supplies	3,681	(2,700)
Natural gas in storage	92,498	76,646
Payments for Removal Costs	(11,089)	(12,621)
Accounts payable	(72,871)	(68,117)
Accrued taxes other than income	2,245	(4,388)
Customer deposits	(1,320)	(4,123)
Increase (Decrease) In Regulatory Assets And Liabilities Current, net	73,872	(58,520)
Increase (Decrease) In Regulatory Assets And Liabilities Noncurrent, net	9,425	2,520
Increase (Decrease) in Other Current Assets and Liabilities, Net	(11,650)	(39,312)
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	7,102	265
Cash provided by operating activities	277,459	108,262
Investing activities
Capital expenditures	(166,597)	(166,751)
Payments for Other Investing Activities	(2,427)	(1,259)
Proceeds from Sale of Other Assets, Investing Activities	1,179	2,029
Cash used in investing activities	(167,845)	(165,981)
Financing activities
Borrowings (repayments) of short-term debt, net	(102,700)	864,900
Repayments of Other Long-Term Debt	(4)	(773,000)
Repayment of securitized utility tariff bonds	(14,547)	(13,780)
Dividends paid	(40,153)	(37,336)
Payment, Tax Withholding, Share-based Payment Arrangement	(2,559)	(980)
Cash used in financing activities	(159,963)	39,804
Change in cash and cash equivalents	(50,349)	(17,915)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Beginning Balance	78,537	39,387
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period	28,188	21,472
Interest Paid, Excluding Capitalized Interest	36,268	41,497
Income Tax Paid, State and Local, after Refund Received	0	(2,797)
Income Tax Paid, Federal, after Refund Received	$ 0	$ 0