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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Income      
Other Income $ 6,055 $ 5,112 $ 3,461
Expense      
Total Operating Expenses 742,221 784,623 787,058
Interest Charges 34,447 31,411 30,408
Nonservice Cost Components of Postretirement Benefits 3,437 4,293 5,509
Income Tax Expense (Benefit) 20,206 17,441 14,588
Net Income 95,851 86,847 82,345
Operating Loss (147,886) (134,880) (129,389)
OTC      
Income      
Equity Income in Earnings of Subsidiaries 106,379 93,731 91,446
Interest Income from Subsidiaries 2,859 3,063 2,839
Other Income 1,317 1,566 550
Total Income 110,555 98,360 94,835
Expense      
Total Operating Expenses 14,007 10,529 9,916
Interest Charges 4,599 4,863 4,043
Interest Charges from Subsidiaries 136 306 387
Nonservice Cost Components of Postretirement Benefits 1,150 1,297 1,422
Total Expense 19,892 16,995 15,768
Income Before Income Taxes 90,663 81,365 79,067
Income Tax Expense (Benefit) (5,188) (5,482) (3,278)
Net Income $ 95,851 $ 86,847 $ 82,345