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Revenue
 6 Months Ended
Jun. 30, 2023
Revenue from Contract with Customer [Abstract]  
Revenue 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 six months ended June 30, 2023 and 2022:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2023202220232022
Operating Revenues
Electric Segment
Retail: Residential$26,974 $33,011 $70,951 $73,743 
Retail: Commercial and Industrial64,989 78,521 155,474 149,527 
Retail: Other1,752 2,071 3,743 3,972 
  Total Retail93,715 113,603 230,168 227,242 
Transmission14,829 11,697 26,936 24,254 
Wholesale2,670 3,537 4,508 6,000 
Other2,549 2,112 4,059 3,869 
Total Electric Segment113,763 130,949 265,671 261,365 
Manufacturing Segment
Metal Parts and Tooling89,396 88,296 179,463 177,869 
Plastic Products and Tooling10,068 11,416 24,211 23,860 
Scrap Metal Sales3,011 3,484 5,583 6,425 
Total Manufacturing Segment102,475 103,196 209,257 208,154 
Plastics Segment
PVC Pipe121,478 165,895 201,869 305,425 
Total Operating Revenue337,716 400,040 676,797 774,944 
Less: Non-contract Revenues Included Above
Electric Segment - ARP Revenues(334)(4,928)(1,545)(7,388)
Total Operating Revenues from Contracts with Customers$338,050 $404,968 $678,342 $782,332