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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2020
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Information for each segment and our unallocated corporate costs for the years ended December 31, 2020, 2019 and 2018 are as follows:
(in thousands)202020192018
Operating Revenue1
Electric$446,088 $459,048 $450,198 
Manufacturing238,770 277,204 268,409 
Plastics205,249 183,251 197,840 
Total$890,107 $919,503 $916,447 
Depreciation and Amortization
Electric$63,171 $60,044 $55,935 
Manufacturing14,933 14,261 14,794 
Plastics3,604 3,451 3,719 
Corporate329 330 218 
Total$82,037 $78,086 $74,666 
Operating Income (Loss)
Electric$107,083 $98,417 $88,031 
Manufacturing16,103 17,869 18,266 
Plastics37,823 28,439 32,917 
Corporate(13,123)(9,845)(9,825)
Total$147,886 $134,880 $129,389 
Interest Charges
Electric$29,848 $26,548 $26,365 
Manufacturing2,215 2,345 2,230 
Plastics644 718 609 
Corporate1,740 1,800 1,204 
Total$34,447 $31,411 $30,408 
Income Tax Expense (Benefit)
Electric$12,480 $12,867 $5,685 
Manufacturing2,939 2,784 3,393 
Plastics9,718 7,309 8,728 
Corporate(4,931)(5,519)(3,218)
Total$20,206 $17,441 $14,588 
Net Income (Loss)
Electric$66,778 $59,046 $54,431 
Manufacturing11,048 12,899 12,839 
Plastics27,582 20,572 23,819 
Corporate(9,557)(5,670)(8,744)
Total$95,851 $86,847 $82,345 
Capital Expenditures
Electric$356,581 $187,362 $87,287 
Manufacturing10,587 14,268 13,316 
Plastics4,322 5,452 4,199 
Corporate63 283 623 
Total$371,553 $207,365 $105,425 
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 December 31, 2020 and 2019:
(in thousands)20202019
Identifiable Assets
Electric$2,233,399 $1,931,525 
Manufacturing191,005 195,742 
Plastics99,767 92,049 
Corporate54,183 54,279 
Total$2,578,354 $2,273,595