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Revenue (Tables)
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
We present 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, 2021 and 2020:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
Operating Revenues
Electric Segment
Retail: Residential$33,902 $32,734 $100,067 $96,440 
Retail: Commercial and Industrial60,557 64,918 185,376 189,771 
Retail: Other1,979 1,953 5,687 5,550 
  Total Retail96,438 99,605 291,130 291,761 
Transmission13,300 12,288 37,085 32,802 
Wholesale6,944 1,500 14,711 3,141 
Other2,093 1,820 5,703 5,509 
Total Electric Segment118,775 115,213 348,629 333,213 
Manufacturing Segment
Metal Parts and Tooling76,455 50,957 210,141 145,435 
Plastic Products and Tooling10,198 7,600 30,624 25,323 
Scrap Metal Sales3,324 1,292 9,320 3,518 
Total Manufacturing Segment89,977 59,849 250,085 174,276 
Plastics Segment
PVC Pipe107,542 60,693 264,898 155,769 
Total Operating Revenue316,294 235,755 863,612 663,258 
Less: Non-contract Revenues Included Above
Electric Segment - ARP Revenues(33)2,778 (2,790)2,900 
Total Operating Revenues from Contracts with Customers$316,327 $232,977 $866,402 $660,358