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Segment Information - Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Total Operating Revenues $ 1,196,844 $ 890,107 $ 919,503
Depreciation and Amortization 91,358 82,037 78,086
Operating Income (Loss) 249,708 147,886 134,880
Interest Charges 37,771 34,447 31,411
Income Tax Expense (Benefit) 36,052 20,206 17,441
Net Income (Loss) 176,769 95,851 86,847
Capital Expenditures 171,829 371,553 207,365
Identifiable Assets 2,754,830 2,578,354  
Corporate      
Segment Reporting Information [Line Items]      
Depreciation and Amortization 225 329 330
Operating Income (Loss) (14,130) (13,123) (9,845)
Interest Charges 1,902 1,740 1,800
Income Tax Expense (Benefit) (4,689) (4,931) (5,519)
Net Income (Loss) (10,698) (9,557) (5,670)
Capital Expenditures 68 63 283
Identifiable Assets 57,445 54,183  
Electric      
Segment Reporting Information [Line Items]      
Total Operating Revenues 480,321 446,088 459,048
Electric | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 480,321 446,088 459,048
Depreciation and Amortization 71,343 63,171 60,044
Operating Income (Loss) 106,964 107,083 98,417
Interest Charges 33,043 29,848 26,548
Income Tax Expense (Benefit) 1,663 12,480 12,867
Net Income (Loss) 72,458 66,778 59,046
Capital Expenditures 140,031 356,581 187,362
Identifiable Assets 2,283,776 2,233,399  
Manufacturing      
Segment Reporting Information [Line Items]      
Total Operating Revenues 336,294 238,770 277,204
Manufacturing | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 336,294 238,770 277,204
Depreciation and Amortization 15,436 14,933 14,261
Operating Income (Loss) 24,114 16,103 17,869
Interest Charges 2,239 2,215 2,345
Income Tax Expense (Benefit) 4,704 2,939 2,784
Net Income (Loss) 17,186 11,048 12,899
Capital Expenditures 20,690 10,587 14,268
Identifiable Assets 251,044 191,005  
Plastics      
Segment Reporting Information [Line Items]      
Total Operating Revenues 380,229 205,249 183,251
Plastics | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 380,229 205,249 183,251
Depreciation and Amortization 4,354 3,604 3,451
Operating Income (Loss) 132,760 37,823 28,439
Interest Charges 587 644 718
Income Tax Expense (Benefit) 34,374 9,718 7,309
Net Income (Loss) 97,823 27,582 20,572
Capital Expenditures 11,040 4,322 $ 5,452
Identifiable Assets $ 162,565 $ 99,767