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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Income      
Other Income $ 12,650 $ 2,037 $ 2,900
Expense      
Nonelectric Selling, General, and Administrative Expenses 72,663 69,718 65,394
Interest Expense 37,677 36,016 37,771
Nonservice Cost Components of Postretirement Benefits (10,597) (1,075) 2,016
Income Before Income Taxes 363,489 357,535 212,821
Income Tax Benefit (69,298) (73,351) (36,052)
Net Income 294,191 284,184 176,769
OTC      
Income      
Other Income 10,496 466 1,290
Total Income 307,861 300,681 192,491
Expense      
Nonelectric Selling, General, and Administrative Expenses 12,816 17,269 14,825
Nonservice Cost Components of Postretirement Benefits 1,063 1,023 1,097
Total Expense 17,698 22,363 20,652
Income Before Income Taxes 290,163 278,318 171,839
Income Tax Benefit 4,028 5,866 4,930
Net Income 294,191 284,184 176,769
OTC | Subsidiaries      
Income      
Equity Income in Earnings of Subsidiaries 294,467 296,833 188,375
Interest Income from Subsidiaries 2,898 3,382 2,826
Expense      
Interest Expense 6 5 3
OTC | Nonrelated Party      
Expense      
Interest Expense $ 3,813 $ 4,066 $ 4,727