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Schedule 1 - Condensed Financial Information of Registrant - Condensed Statements of Income, Parent Company (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income      
Other Income (Expense), net $ 2,900 $ 6,055 $ 5,112
Expense      
Total Operating Expenses 947,136 742,221 784,623
Interest Charges 37,771 34,447 31,411
Nonservice Cost Components of Postretirement Benefits 2,016 3,437 4,293
Income Tax Expense (Benefit) (36,052) (20,206) (17,441)
Net Income 176,769 95,851 86,847
OTC      
Income      
Equity Income in Earnings of Subsidiaries 188,375 106,379 93,731
Interest Income from Subsidiaries 2,826 2,859 3,063
Other Income (Expense), net 1,290 1,317 1,566
Total Income 192,491 110,555 98,360
Expense      
Total Operating Expenses 14,825 14,007 10,529
Interest Charges 4,727 4,599 4,863
Interest Charges from Subsidiaries 3 136 306
Nonservice Cost Components of Postretirement Benefits 1,097 1,150 1,297
Total Expense 20,652 19,892 16,995
Income Before Income Taxes 171,839 90,663 81,365
Income Tax Expense (Benefit) 4,930 5,188 5,482
Net Income $ 176,769 $ 95,851 $ 86,847