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Revenue (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
We present our operating revenues to 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, 2021, 2020 and 2019:
(in thousands)202120202019
Operating Revenues
Electric Segment
Retail: Residential$135,361 $127,260 $131,988 
Retail: Commercial and Industrial262,408 254,951 267,125 
Retail: Other7,715 7,311 7,365 
  Total Retail405,484 389,522 406,478 
Transmission48,835 44,001 40,542 
Wholesale17,936 4,857 5,007 
Other8,066 7,708 7,021 
Total Electric Segment480,321 446,088 459,048 
Manufacturing Segment
Metal Parts and Tooling283,527 199,463 236,032 
Plastic Products and Tooling40,231 34,055 35,173 
Other12,536 5,252 5,999 
Total Manufacturing Segment336,294 238,770 277,204 
Plastics Segment
PVC Pipe380,229 205,249 183,251 
Total Operating Revenue1,196,844 890,107 919,503 
Less: Noncontract Revenues Included Above— — 
Electric Segment - ARP Revenues(791)6,936 1,032 
Total Operating Revenues from Contracts with Customers$1,197,635 $883,171 $918,471