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Segment Information
 3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]  
Segment Information Segment Information
We classify our business into three segments, Electric, Manufacturing and Plastics, consistent with our business strategy, organizational structure and our internal reporting and review processes used by our chief operating decision maker to make decisions regarding allocation of resources, to assess operating performance and to make strategic decisions.
Certain assets and costs are not allocated to our operating segments. Corporate operating costs include items such as corporate staff and overhead costs, the results of our captive insurance company and other items excluded from the measurement of operating segment performance. Corporate assets consist primarily of cash, prepaid expenses, investments and fixed assets. Corporate is not an operating segment, rather it is added to operating segment totals to reconcile to consolidated amounts.
Information for each segment and our unallocated corporate costs for the three months ended March 31, 2021 and 2020 are as follows:
(in thousands)20212020
Operating Revenue1
Electric$123,699 $119,870 
Manufacturing75,825 68,479 
Plastics62,186 46,398 
Total$261,710 $234,747 
Net Income (Loss)
Electric$17,587 $16,182 
Manufacturing5,385 4,927 
Plastics9,147 5,449 
Corporate(1,790)(2,290)
Total$30,329 $24,268 
1Amounts reflect operating revenues to external customers. Intersegment operating revenues are not material for any period presented.
The following provides the identifiable assets by segment and corporate assets as of March 31, 2021 and December 31, 2020:
(in thousands)March 31,
2021		December 31,
2020
Identifiable Assets
Electric$2,242,026 $2,233,399 
Manufacturing209,477 191,005 
Plastics111,148 99,767 
Corporate55,889 54,183 
Total$2,618,540 $2,578,354