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Condensed Consolidated Statements Of Operations And Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Condensed Consolidated Statements Of Operations And Comprehensive Income [Abstract]
Operating revenues	$ 476,971	$ 435,255	$ 1,775,504	$ 1,481,730
Operating expenses:
Operations and maintenance	153,088	144,368	439,422	423,780
Purchased gas	22,506	19,095	263,882	182,498
Depreciation	103,322	91,448	299,628	269,742
Amortization	3,744	1,153	10,334	3,309
Taxes other than income taxes	24,540	24,102	68,291	71,359
Total operating expenses	307,200	280,166	1,081,557	950,688
Operating income	169,771	155,089	693,947	531,042
Other expense (income):
Interest expense	82,269	76,846	244,143	223,164
Interest income	(1,079)	(1,394)	(1,609)	(2,659)
Allowance for funds used during construction	(6,180)	(5,593)	(19,039)	(15,503)
Gain on sale of other assets	(176)	(239)	(669)	(92,067)
Other, net	(1,439)	227	(848)	486
Income before income taxes	96,376	85,242	471,969	417,621
Income tax expense (benefit)	4,299	15,840	(11,724)	7,062
Net income	92,077	69,402	483,693	410,559
Comprehensive income	$ 92,077	$ 69,402	$ 483,693	$ 410,559
Net income per common share:
Basic	$ 0.33	$ 0.25	$ 1.73	$ 1.50
Diluted	$ 0.33	$ 0.25	$ 1.73	$ 1.50
Average common shares outstanding during the period:
Basic	281,784	274,021	279,027	273,656
Diluted	282,298	274,543	279,560	274,127

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