Investment in ATC and ATC Holdco (Details-2) - ATC [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Schedule of Equity Method Investments [Line Items]
Operating revenues	$ 280,753	$ 245,104	$ 820,060	$ 721,260
Operating expenses	(129,377)	(116,919)	(386,418)	(351,228)
Other income, net	87	188	2,015	821
Interest expense, net	(47,330)	(41,593)	(137,731)	(124,040)
Earnings before members' income taxes	$ 104,133	$ 86,780	$ 297,926	$ 246,813

The aggregate cost of goods produced and sold and services rendered during the reporting period.

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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