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Revenue
 9 Months Ended
Sep. 30, 2023
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, 2023 and 2022:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2023202220232022
Operating Revenues
Electric Segment
Retail: Residential$33,483 $35,122 $104,433 $108,883 
Retail: Commercial and Industrial75,044 83,022 230,517 232,532 
Retail: Other1,972 2,033 5,717 6,004 
  Total Retail110,499 120,177 340,667 347,419 
Transmission13,670 13,156 40,606 37,409 
Wholesale4,752 7,196 9,260 13,196 
Other1,405 2,218 5,464 6,088 
Total Electric Segment130,326 142,747 395,997 404,112 
Manufacturing Segment
Metal Parts and Tooling89,518 84,054 268,981 261,923 
Plastic Products and Tooling8,847 12,723 33,059 36,584 
Scrap Metal
2,313 1,990 7,896 8,414 
Total Manufacturing Segment100,678 98,767 309,936 306,921 
Plastics Segment
PVC Pipe127,052 142,342 328,920 447,767 
Total Operating Revenue358,056 383,856 1,034,853 1,158,800 
Less: Non-contract Revenues Included Above
Electric Segment - ARP Revenues(744)(548)(2,289)(7,937)
Total Operating Revenues from Contracts with Customers$358,800 $384,404 $1,037,142 $1,166,737