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Revenue (Tables)
 9 Months Ended
Sep. 30, 2022
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
Presented below are our operating revenues to 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, 2022 and 2021:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2022202120222021
Operating Revenues
Electric Segment
Retail: Residential$35,122 $33,902 $108,883 $100,067 
Retail: Commercial and Industrial83,022 60,557 232,532 185,376 
Retail: Other2,033 1,979 6,004 5,687 
  Total Retail120,177 96,438 347,419 291,130 
Transmission13,156 13,300 37,409 37,085 
Wholesale7,196 6,944 13,196 14,711 
Other2,218 2,093 6,088 5,703 
Total Electric Segment142,747 118,775 404,112 348,629 
Manufacturing Segment
Metal Parts and Tooling84,054 76,455 261,923 210,141 
Plastic Products and Tooling12,723 10,198 36,584 30,624 
Scrap Metal Sales1,990 3,324 8,414 9,320 
Total Manufacturing Segment98,767 89,977 306,921 250,085 
Plastics Segment
PVC Pipe142,342 107,542 447,767 264,898 
Total Operating Revenue383,856 316,294 1,158,800 863,612 
Less: Non-contract Revenues Included Above
Electric Segment - ARP Revenues(548)(33)(7,937)(2,790)
Total Operating Revenues from Contracts with Customers$384,404 $316,327 $1,166,737 $866,402