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Segment Information - Schedule of Segment Profit or Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Operating Revenue $ 337,353 $ 347,068
Operating and Maintenance Expenses 48,881 47,977
Depreciation and Amortization 29,375 25,897
Property Taxes 4,228 4,367
Interest Expense 11,553 9,850
Selling, General, and Administrative Expenses 21,292 18,914
Income Tax (Benefit) Expense 10,085 17,808
Net Income 68,099 74,338
Electric    
Segment Reporting Information [Line Items]    
Operating Revenue 149,720 141,488
Manufacturing    
Segment Reporting Information [Line Items]    
Operating Revenue 81,685 99,380
Plastics    
Segment Reporting Information [Line Items]    
Operating Revenue 105,948 106,200
Operating Segments    
Segment Reporting Information [Line Items]    
Interest Expense 11,426 9,672
Income Tax (Benefit) Expense 11,557 19,202
Net Income 69,679 74,471
Operating Segments | Electric    
Segment Reporting Information [Line Items]    
Operating Revenue 149,720 141,488
Production Fuel and Purchased Power 45,191 40,215
Operating and Maintenance Expenses 48,881 47,977
Depreciation and Amortization 22,377 19,887
Property Taxes 4,228 4,367
Interest Expense 10,657 8,954
Income Tax (Benefit) Expense (4,008) 1,175
Other Segment Items (2,314) (3,557)
Net Income 24,708 22,470
Operating Segments | Manufacturing    
Segment Reporting Information [Line Items]    
Operating Revenue 81,685 99,380
Depreciation and Amortization 5,424 4,912
Interest Expense 623 571
Cost of Goods Sold 68,516 80,615
Selling, General, and Administrative Expenses 10,743 11,352
Income Tax (Benefit) Expense 272 1,582
Other Segment Items (1) (1)
Net Income 1,532 5,261
Operating Segments | Plastics    
Segment Reporting Information [Line Items]    
Operating Revenue 105,948 106,200
Depreciation and Amortization 1,546 1,075
Interest Expense 146 147
Cost of Goods Sold 40,087 37,810
Selling, General, and Administrative Expenses 6,985 5,085
Income Tax (Benefit) Expense 15,293 16,445
Other Segment Items (2) (27)
Net Income $ 43,439 $ 46,740