Investment in ATC and ATC Holdco (Details-2) - ATC [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 241,227	$ 218,222	$ 476,156	$ 430,150
Operating expenses	(117,564)	(109,197)	(234,309)	(214,039)
Other income, net	550	356	633	543
Interest expense, net	(43,254)	(36,040)	(82,447)	(71,458)
Earnings before members' income taxes	$ 80,959	$ 73,341	$ 160,033	$ 145,196