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Revenue (Tables)
 12 Months Ended
Dec. 31, 2024
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, 2024, 2023 and 2022:
(in thousands)202420232022
Operating Revenues
Electric Segment
Retail: Residential$133,408 $135,570 $143,888 
Retail: Commercial and Industrial311,968 312,551 318,494 
Retail: Other7,838 7,719 7,918 
  Total Retail453,214 455,840 470,300 
Transmission53,517 52,555 52,213 
Wholesale11,077 12,459 18,539 
Other6,707 7,505 8,647 
Total Electric Segment524,515 528,359 549,699 
Manufacturing Segment
Metal Parts and Tooling303,077 351,267 338,865 
Plastic Products and Tooling32,210 41,395 49,080 
Scrap Metal7,305 10,119 10,038 
Total Manufacturing Segment342,592 402,781 397,983 
Plastics Segment
PVC Pipe463,441 418,026 512,527 
Total Operating Revenue1,330,548 1,349,166 1,460,209 
Less: Noncontract Revenues Included Above
Electric Segment - ARP Revenues575 (4,310)(9,266)
Total Operating Revenues from Contracts with Customers$1,329,973 $1,353,476 $1,469,475