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Segment Information - Schedule of Segment Profit or Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Operating Revenue $ 1,330,548 $ 1,349,166 $ 1,460,209
Operating and Maintenance Expenses 190,422 191,263 181,378
Depreciation and Amortization 107,121 97,954 92,597
Property Taxes 15,662 16,614 17,742
Interest Expense 41,815 37,677 36,016
Selling, General, and Administrative Expenses 80,065 72,663 69,718
Income Tax Expense (Benefit) 65,230 69,298 73,351
Net Income 301,662 294,191 284,184
Electric      
Segment Reporting Information [Line Items]      
Operating Revenue 524,515 528,359 549,699
Manufacturing      
Segment Reporting Information [Line Items]      
Operating Revenue 342,592 402,781 397,983
Plastics      
Segment Reporting Information [Line Items]      
Operating Revenue 463,441 418,026 512,527
Operating Segments      
Segment Reporting Information [Line Items]      
Interest Expense 41,322 36,761 35,331
Income Tax Expense (Benefit) 71,995 73,104 79,074
Net Income 305,391 293,626 296,298
Operating Segments | Electric      
Segment Reporting Information [Line Items]      
Operating Revenue 524,515 528,359 549,699
Production Fuel and Purchased Power 122,506 138,631 165,391
Operating and Maintenance Expenses 190,422 191,263 181,378
Depreciation and Amortization 82,136 75,330 72,050
Property Taxes 15,662 16,614 17,742
Interest Expense 38,216 33,864 31,950
Income Tax Expense (Benefit) (1,544) 1,648 5,065
Other Segment Items (13,846) (13,415) (3,851)
Net Income 90,963 84,424 79,974
Operating Segments | Manufacturing      
Segment Reporting Information [Line Items]      
Operating Revenue 342,592 402,781 397,983
Depreciation and Amortization 20,393 18,495 16,202
Interest Expense 2,516 2,295 2,796
Cost of Goods Sold 283,390 324,245 327,228
Selling, General, and Administrative Expenses 40,110 49,396 41,690
Income Tax Expense (Benefit) 2,895 5,390 5,321
Other Segment Items 0 1 (2)
Net Income 13,681 21,454 20,950
Operating Segments | Plastics      
Segment Reporting Information [Line Items]      
Operating Revenue 463,441 418,026 512,527
Depreciation and Amortization 4,494 4,027 4,205
Interest Expense 590 602 585
Cost of Goods Sold 166,628 143,521 227,571
Selling, General, and Administrative Expenses 24,908 20,103 20,378
Income Tax Expense (Benefit) 70,644 66,066 68,688
Other Segment Items (76) (14) (69)
Net Income $ 200,747 $ 187,748 $ 195,374