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Segment Information - Schedule of Segment Profit or Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Operating Revenue $ 325,563 $ 338,033 $ 995,959 $ 1,027,437
Operating and Maintenance Expenses 41,144 43,737 136,830 136,367
Depreciation and Amortization 29,554 27,051 88,376 79,579
Property Taxes 4,333 3,705 12,788 11,691
Interest Expense 11,790 11,173 35,063 31,225
Selling, General, and Administrative Expenses 17,792 18,829 56,434 55,896
Income Tax (Benefit) Expense 12,817 18,677 36,553 57,077
Net Income 78,292 85,479 224,119 246,812
Electric        
Segment Reporting Information [Line Items]        
Operating Revenue 138,597 130,380 417,048 384,696
Manufacturing        
Segment Reporting Information [Line Items]        
Operating Revenue 76,951 79,896 237,363 275,961
Plastics        
Segment Reporting Information [Line Items]        
Operating Revenue 110,015 127,757 341,548 366,780
Operating Segments        
Segment Reporting Information [Line Items]        
Interest Expense 11,670 11,084 34,791 30,843
Income Tax (Benefit) Expense 15,757 19,960 42,487 61,224
Net Income 74,719 85,183 220,179 245,586
Operating Segments | Electric        
Segment Reporting Information [Line Items]        
Operating Revenue 138,597 130,380 417,048 384,696
Production Fuel and Purchased Power 34,937 25,726 111,917 87,516
Operating and Maintenance Expenses 41,144 43,737 136,830 136,367
Depreciation and Amortization 22,433 20,741 67,087 61,014
Property Taxes 4,333 3,705 12,788 11,691
Interest Expense 10,891 10,274 32,370 28,534
Income Tax (Benefit) Expense (701) 948 (9,178) 723
Other Segment Items (1,748) (3,281) (5,977) (10,635)
Net Income 27,308 28,530 71,211 69,486
Operating Segments | Manufacturing        
Segment Reporting Information [Line Items]        
Operating Revenue 76,951 79,896 237,363 275,961
Depreciation and Amortization 5,411 5,199 16,357 15,199
Interest Expense 633 664 1,882 1,865
Cost of Goods Sold 61,283 68,360 193,108 224,595
Selling, General, and Administrative Expenses 9,978 8,853 31,071 31,667
Income Tax (Benefit) Expense 1,141 (154) 2,371 3,563
Other Segment Items 0 (1) 1 0
Net Income 3,916 2,174 8,930 14,271
Operating Segments | Plastics        
Segment Reporting Information [Line Items]        
Operating Revenue 110,015 127,757 341,548 366,780
Depreciation and Amortization 1,636 1,086 4,771 3,293
Interest Expense 146 146 539 444
Cost of Goods Sold 44,139 47,056 131,155 129,867
Selling, General, and Administrative Expenses 6,919 6,956 20,526 17,777
Income Tax (Benefit) Expense 15,317 19,166 49,294 56,938
Other Segment Items (1) (46) (4) (75)
Net Income $ 43,495 $ 54,479 $ 140,038 $ 161,829