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Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Total Operating Revenues $ 338,033 $ 358,056 $ 1,027,437 $ 1,034,853
Total Operating Revenues from Contracts with Customers 337,386 358,800 1,027,024 1,037,142
Electric        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 130,380 130,326 384,696 395,997
Electric Segment - ARP Revenues 647 (744) 413 (2,289)
Manufacturing        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 79,896 100,678 275,961 309,936
Plastics        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 127,757 127,052 366,780 328,920
Total Retail | Electric        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 110,802 110,499 331,673 340,667
Retail: Residential | Electric        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 34,150 33,483 99,971 104,433
Retail: Commercial and Industrial | Electric        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 74,602 75,044 225,827 230,517
Retail: Other | Electric        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 2,050 1,972 5,875 5,717
Transmission | Electric        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 15,152 13,670 39,805 40,606
Wholesale | Electric        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 3,139 4,752 8,273 9,260
Other | Electric        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 1,287 1,405 4,945 5,464
Metal Parts and Tooling | Manufacturing        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 69,904 89,518 245,972 268,981
Plastic Products and Tooling | Manufacturing        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues 8,537 8,847 23,989 33,059
Scrap Metal | Manufacturing        
Disaggregation of Revenue [Line Items]        
Total Operating Revenues $ 1,455 $ 2,313 $ 6,000 $ 7,896