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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income |  |  |
Other Income (Expense), net | $ 2,037 | $ 2,900 | $ 6,055
Expense |  |  |
Total Operating Expenses | 1,069,770 | 947,136 | 742,221
Interest Charges | 36,016 | 37,771 | 34,447
Nonservice Cost Components of Postretirement Benefits | (1,075) | 2,016 | 3,437
Income Before Income Taxes | 357,535 | 212,821 | 116,057
Income Tax Expense (Benefit) | (73,351) | (36,052) | (20,206)
Net Income | 284,184 | 176,769 | 95,851
OTC |  |  |
Income |  |  |
Equity Income in Earnings of Subsidiaries | 296,833 | 188,375 | 106,379
Interest Income from Subsidiaries | 3,382 | 2,826 | 2,859
Other Income (Expense), net | 466 | 1,290 | 1,317
Total Income | 300,681 | 192,491 | 110,555
Expense |  |  |
Total Operating Expenses | 17,269 | 14,825 | 14,007
Interest Charges | 4,066 | 4,727 | 4,599
Interest Charges from Subsidiaries | 5 | 3 | 136
Nonservice Cost Components of Postretirement Benefits | 1,023 | 1,097 | 1,150
Total Expense | 22,363 | 20,652 | 19,892
Income Before Income Taxes | 278,318 | 171,839 | 90,663
Income Tax Expense (Benefit) | 5,866 | 4,930 | 5,188
Net Income | $ 284,184 | $ 176,769 | $ 95,851

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