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Revenue (Tables)
 12 Months Ended
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
We present our operating revenues from external customers, in total and by amounts arising from contracts with customers and ARP arrangements, disaggregated by revenue source and segment for the years ended December 31, 2023, 2022 and 2021:
(in thousands)202320222021
Operating Revenues
Electric Segment
Retail: Residential$135,570 $143,888 $135,361 
Retail: Commercial and Industrial312,551 318,494 262,408 
Retail: Other7,719 7,918 7,715 
  Total Retail455,840 470,300 405,484 
Transmission52,555 52,213 48,835 
Wholesale12,459 18,539 17,936 
Other7,505 8,647 8,066 
Total Electric Segment528,359 549,699 480,321 
Manufacturing Segment
Metal Parts and Tooling351,267 338,865 283,527 
Plastic Products and Tooling41,395 49,080 40,231 
Scrap Metal10,119 10,038 12,536 
Total Manufacturing Segment402,781 397,983 336,294 
Plastics Segment
PVC Pipe418,026 512,527 380,229 
Total Operating Revenue1,349,166 1,460,209 1,196,844 
Less: Noncontract Revenues Included Above
Electric Segment - ARP Revenues(4,310)(9,266)(791)
Total Operating Revenues from Contracts with Customers$1,353,476 $1,469,475 $1,197,635