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Segment Information - Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Total Operating Revenues $ 890,107 $ 919,503 $ 916,447
Depreciation and Amortization 82,037 78,086 74,666
Operating Income (Loss) 147,886 134,880 129,389
Interest Charges 34,447 31,411 30,408
Income Tax Expense (Benefit) 20,206 17,441 14,588
Net Income (Loss) 95,851 86,847 82,345
Capital Expenditures 371,553 207,365 105,425
Identifiable Assets 2,578,354 2,273,595  
Corporate      
Segment Reporting Information [Line Items]      
Depreciation and Amortization 329 330 218
Operating Income (Loss) (13,123) (9,845) (9,825)
Interest Charges 1,740 1,800 1,204
Income Tax Expense (Benefit) (4,931) (5,519) (3,218)
Net Income (Loss) (9,557) (5,670) (8,744)
Capital Expenditures 63 283 623
Identifiable Assets 54,183 54,279  
Electric | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 446,088 459,048 450,198
Depreciation and Amortization 63,171 60,044 55,935
Operating Income (Loss) 107,083 98,417 88,031
Interest Charges 29,848 26,548 26,365
Income Tax Expense (Benefit) 12,480 12,867 5,685
Net Income (Loss) 66,778 59,046 54,431
Capital Expenditures 356,581 187,362 87,287
Identifiable Assets 2,233,399 1,931,525  
Manufacturing | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 238,770 277,204 268,409
Depreciation and Amortization 14,933 14,261 14,794
Operating Income (Loss) 16,103 17,869 18,266
Interest Charges 2,215 2,345 2,230
Income Tax Expense (Benefit) 2,939 2,784 3,393
Net Income (Loss) 11,048 12,899 12,839
Capital Expenditures 10,587 14,268 13,316
Identifiable Assets 191,005 195,742  
Plastics | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 205,249 183,251 197,840
Depreciation and Amortization 3,604 3,451 3,719
Operating Income (Loss) 37,823 28,439 32,917
Interest Charges 644 718 609
Income Tax Expense (Benefit) 9,718 7,309 8,728
Net Income (Loss) 27,582 20,572 23,819
Capital Expenditures 4,322 5,452 $ 4,199
Identifiable Assets $ 99,767 $ 92,049