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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating Loss      
Operating Expenses $ 784,623 $ 787,058 $ 717,063
Operating Loss 134,880 129,389 132,287
Other Income (Expense)      
Interest Charges (31,411) (30,408) (29,604)
Nonservice Cost Components of Postretirement Benefits 4,293 5,509 5,620
Other Income 5,112 3,461 2,632
Income Tax (Benefit) Expense 17,441 14,588 27,256
Net Income 86,847 82,345 72,439
Parent Company [Member]      
Operating Loss      
Revenue from Contracts with Customers 0 0 0
Operating Expenses 10,529 9,916 7,138
Operating Loss (10,529) (9,916) (7,138)
Other Income (Expense)      
Equity Income in Earnings of Subsidiaries 93,731 91,446 82,715
Interest Charges (4,863) (4,043) (4,270)
Interest Charges to Subsidiaries (306) (387) (244)
Interest Income from Subsidiaries 3,063 2,839 2,848
Nonservice Cost Components of Postretirement Benefits 1,297 1,422 1,215
Other Income 1,566 550 1,054
Total Other Income 91,894 88,983 80,888
Income Before Income Taxes 81,365 79,067 73,750
Income Tax (Benefit) Expense (5,482) (3,278) 1,311
Net Income $ 86,847 $ 82,345 $ 72,439