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Schedule I - Condensed Financial Information of Registrant - CONDENSED STATEMENTS OF INCOME, PARENT COMPANY (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income      
Other Income $ 18,848 $ 12,650 $ 2,037
Expense      
Nonelectric Selling, General, and Administrative Expenses 80,065 72,663 69,718
Interest Expense 41,815 37,677 36,016
Nonservice Cost Components of Postretirement Benefits (9,609) (10,597) (1,075)
Income Before Income Taxes 366,892 363,489 357,535
Income Tax Benefit (65,230) (69,298) (73,351)
Net Income 301,662 294,191 284,184
OTC      
Income      
Other Income 15,085 10,496 466
Total Income 322,717 307,861 300,681
Expense      
Nonelectric Selling, General, and Administrative Expenses 23,016 12,816 17,269
Nonservice Cost Components of Postretirement Benefits 970 1,063 1,023
Total Expense 27,590 17,698 22,363
Income Before Income Taxes 295,127 290,163 278,318
Income Tax Benefit 6,535 4,028 5,866
Net Income 301,662 294,191 284,184
OTC | Subsidiaries      
Income      
Equity Income in Earnings of Subsidiaries 304,525 294,467 296,833
Interest Income from Subsidiaries 3,107 2,898 3,382
Expense      
Interest Expense 5 6 5
OTC | Nonrelated Party      
Expense      
Interest Expense $ 3,599 $ 3,813 $ 4,066