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Revenue
 3 Months Ended
Mar. 31, 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 months ended March 31, 2023 and 2022:
Three Months Ended March 31,
(in thousands)20232022
Operating Revenues
Electric Segment
Retail: Residential$43,972 $40,561 
Retail: Commercial and Industrial90,489 71,171 
Retail: Other1,992 1,907 
  Total Retail136,453 113,639 
Transmission12,107 12,556 
Wholesale1,838 2,463 
Other1,511 1,758 
Total Electric Segment151,909 130,416 
Manufacturing Segment
Metal Parts and Tooling90,068 89,573 
Plastic Products and Tooling14,142 12,445 
Scrap Metal Sales2,572 2,939 
Total Manufacturing Segment106,782 104,957 
Plastics Segment
PVC Pipe80,390 139,531 
Total Operating Revenue339,081 374,904 
Less: Non-contract Revenues Included Above
Electric Segment - ARP Revenues(1,210)(2,460)
Total Operating Revenues from Contracts with Customers$340,291 $377,364