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Revenue
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Revenue 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, 2020, 2019 and 2018:
(in thousands)202020192018
Operating Revenues
Electric Segment
Retail: Residential$127,260 $131,988 $125,045 
Retail: Commercial and Industrial254,951 267,125 256,331 
Retail: Other7,311 7,365 6,875 
  Total Retail389,522 406,478 388,251 
Transmission44,001 40,542 46,947 
Wholesale4,857 5,007 7,735 
Other7,708 7,021 7,265 
Total Electric Segment446,088 459,048 450,198 
Manufacturing Segment
Metal Parts and Tooling199,463 236,032 223,765 
Plastic Products and Tooling34,055 35,173 35,836 
Other5,252 5,999 8,808 
Total Manufacturing Segment238,770 277,204 268,409 
Plastics Segment
PVC Pipe205,249 183,251 197,840 
Total Operating Revenue890,107 919,503 916,447 
Less: Noncontract Revenues Included Above— — 
Electric Segment - Alternative Revenue Program Revenues6,936 1,032 (439)
Total Operating Revenues from Contracts with Customers$883,171 $918,471 $916,886