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Segment Information - Schedule of Segment Profit or Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Operating Revenue $ 333,043 $ 342,336 $ 670,396 $ 689,404
Operating and Maintenance Expenses 46,804 44,652 95,685 92,630
Depreciation and Amortization 29,447 26,632 58,822 52,528
Property Taxes 4,227 3,619 8,455 7,986
Interest Expense 11,720 10,202 23,273 20,052
Selling, General, and Administrative Expenses 17,352 18,154 38,644 37,067
Income Tax (Benefit) Expense 13,652 20,592 23,737 38,400
Net Income 77,728 86,995 145,827 161,333
Electric        
Segment Reporting Information [Line Items]        
Operating Revenue 128,731 112,828 278,451 254,317
Manufacturing        
Segment Reporting Information [Line Items]        
Operating Revenue 78,726 96,684 160,412 196,065
Plastics        
Segment Reporting Information [Line Items]        
Operating Revenue 125,586 132,824 231,533 239,022
Operating Segments        
Segment Reporting Information [Line Items]        
Interest Expense 11,695 10,089 23,120 19,761
Income Tax (Benefit) Expense 15,173 22,061 26,730 41,263
Net Income 75,780 85,932 145,459 160,402
Operating Segments | Electric        
Segment Reporting Information [Line Items]        
Operating Revenue 128,731 112,828 278,451 254,317
Production Fuel and Purchased Power 31,789 21,573 76,980 61,789
Operating and Maintenance Expenses 46,804 44,652 95,685 92,630
Depreciation and Amortization 22,278 20,387 44,655 40,273
Property Taxes 4,227 3,619 8,455 7,986
Interest Expense 10,822 9,307 21,479 18,261
Income Tax (Benefit) Expense (4,469) (1,401) (8,477) (225)
Other Segment Items (1,915) (3,794) (4,229) (7,353)
Net Income 19,195 18,485 43,903 40,956
Operating Segments | Manufacturing        
Segment Reporting Information [Line Items]        
Operating Revenue 78,726 96,684 160,412 196,065
Depreciation and Amortization 5,523 5,087 10,946 9,999
Interest Expense 627 631 1,249 1,202
Cost of Goods Sold 63,311 75,620 131,827 156,235
Selling, General, and Administrative Expenses 10,350 11,464 21,093 22,816
Income Tax (Benefit) Expense 958 2,135 1,230 3,717
Other Segment Items (1) (1) 0 (1)
Net Income 3,481 6,835 5,013 12,096
Operating Segments | Plastics        
Segment Reporting Information [Line Items]        
Operating Revenue 125,586 132,824 231,533 239,022
Depreciation and Amortization 1,588 1,133 3,135 2,208
Interest Expense 246 151 392 298
Cost of Goods Sold 46,929 44,998 87,016 82,809
Selling, General, and Administrative Expenses 6,623 5,737 13,608 10,821
Income Tax (Benefit) Expense 18,684 21,327 33,977 37,771
Other Segment Items 0 (1) (3) (27)
Net Income $ 53,104 $ 60,612 $ 96,543 $ 107,350