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Revenue
 9 Months Ended
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Presented below are our operating revenues from external customers, in total and by amounts arising from contracts with customers and alternative revenue program (ARP) arrangements, disaggregated by revenue source and segment for the three and nine months ended September 30, 2024 and 2023:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2024202320242023
Operating Revenues
Electric Segment
Retail: Residential$34,150 $33,483 $99,971 $104,433 
Retail: Commercial and Industrial74,602 75,044 225,827 230,517 
Retail: Other2,050 1,972 5,875 5,717 
  Total Retail110,802 110,499 331,673 340,667 
Transmission15,152 13,670 39,805 40,606 
Wholesale3,139 4,752 8,273 9,260 
Other1,287 1,405 4,945 5,464 
Total Electric Segment130,380 130,326 384,696 395,997 
Manufacturing Segment
Metal Parts and Tooling69,904 89,518 245,972 268,981 
Plastic Products and Tooling8,537 8,847 23,989 33,059 
Scrap Metal1,455 2,313 6,000 7,896 
Total Manufacturing Segment79,896 100,678 275,961 309,936 
Plastics Segment
PVC Pipe127,757 127,052 366,780 328,920 
Total Operating Revenue338,033 358,056 1,027,437 1,034,853 
Less: Non-contract Revenues Included Above
Electric Segment - ARP Revenues647 (744)413 (2,289)
Total Operating Revenues from Contracts with Customers$337,386 $358,800 $1,027,024 $1,037,142