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Condensed Consolidated Statements Of Cash Flow - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash flows from operating activities:    
Net income $ 483,693 $ 410,559
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 309,962 273,051
Deferred income taxes (15,611) 1,569
Provision for doubtful accounts 14,802 15,818
Stock-based compensation 11,843 5,363
Gain on sale of utility systems and other assets (669) (92,067)
Net change in receivables, deferred purchased gas costs, inventory and prepayments 14,100 (9,543)
Net change in payables, accrued interest, accrued taxes and other accrued liabilities (29,877) 40,703
Pension and other postretirement benefits contributions (3,945) (9,394)
Other, net 20,049 (13,549)
Net cash flows from operating activities 804,347 622,510
Cash flows from investing activities:    
Property, plant and equipment additions, including the debt component of allowance for funds used during construction of $5,795 and $5,381 (983,089) (932,498)
Acquisitions of utility systems, net (57,004) (602)
Net proceeds from the sale of utility systems and other assets 805 167,274
Convertible note investment (22,350)
Other, net (286) (218)
Net cash flows used in investing activities (1,061,924) (766,044)
Cash flows from financing activities:    
Customers' advances and contributions in aid of construction 15,371 10,245
Repayments of customers' advances (3,701) (4,121)
Net repayments of short-term debt (90,176) (17,106)
Net proceeds from commercial paper program 152,525
Proceeds from other long-term debt 1,312,446 1,394,411
Repayments of other long-term debt (1,146,488) (1,024,722)
Change in cash overdraft position (18,468) 3,437
Proceeds from issuance of common stock under dividend reinvestment plan 11,467 11,603
Proceeds from issuance of common stock from at-the-market sale agreement 300,117 32,083
Proceeds from exercised stock options 509 538
Repurchase of common stock (2,275) (2,234)
Dividends paid on common stock (276,872) (257,011)
Other, net 363 235
Net cash flows from financing activities 254,818 147,358
Net change in cash and cash equivalents (2,759) 3,824
Cash and cash equivalents at beginning of period 9,156 4,612
Cash and cash equivalents at end of period 6,397 8,436
Non-cash investing activities:    
Property, plant and equipment additions purchased at the period end, but not yet paid for 135,873 121,371
Non-cash utility property contributions $ 18,585 $ 37,098