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Revenue
 3 Months Ended
Mar. 31, 2025
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
We present 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 months ended March 31, 2025 and 2024:
Three Months Ended March 31,
(in thousands)20252024
Operating Revenues
Electric Segment
Retail: Residential$43,257 $39,457 
Retail: Commercial and Industrial87,889 83,028 
Retail: Other2,227 2,004 
  Total Retail133,373 124,489 
Transmission12,130 12,214 
Wholesale2,778 3,465 
Other1,439 1,320 
Total Electric Segment149,720 141,488 
Manufacturing Segment
Metal Parts and Tooling70,870 87,915 
Plastic Products and Tooling8,959 8,986 
Scrap Metal1,856 2,479 
Total Manufacturing Segment81,685 99,380 
Plastics Segment
PVC Pipe105,948 106,200 
Total Operating Revenue337,353 347,068 
Less: Non-contract Revenues Included Above
Electric Segment - ARP Revenues18 (173)
Total Operating Revenues from Contracts with Customers$337,335 $347,241