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Revenue (Tables)
 6 Months Ended
Jun. 30, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of 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 six months ended June 30, 2024 and 2023:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2024202320242023
Operating Revenues
Electric Segment
Retail: Residential$26,369 $26,974 $65,824 $70,951 
Retail: Commercial and Industrial68,191 64,989 151,221 155,474 
Retail: Other1,822 1,752 3,826 3,743 
  Total Retail96,382 93,715 220,871 230,168 
Transmission12,440 14,829 24,654 26,936 
Wholesale1,669 2,670 5,134 4,508 
Other2,337 2,549 3,658 4,059 
Total Electric Segment112,828 113,763 254,317 265,671 
Manufacturing Segment
Metal Parts and Tooling88,152 89,396 176,067 179,463 
Plastic Products and Tooling6,467 10,068 15,453 24,211 
Scrap Metal2,065 3,011 4,545 5,583 
Total Manufacturing Segment96,684 102,475 196,065 209,257 
Plastics Segment
PVC Pipe132,824 121,478 239,022 201,869 
Total Operating Revenue342,336 337,716 689,404 676,797 
Less: Non-contract Revenues Included Above
Electric Segment - ARP Revenues(62)(334)(234)(1,545)
Total Operating Revenues from Contracts with Customers$342,398 $338,050 $689,638 $678,342