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Segment Information - Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Operating Revenue $ 1,460,209 $ 1,196,844 $ 890,107
Depreciation and Amortization 92,597 91,358 82,037
Operating Income (Loss) 390,439 249,708 147,886
Interest Charges 36,016 37,771 34,447
Income Tax Expense (Benefit) 73,351 36,052 20,206
Net Income (Loss) 284,184 176,769 95,851
Capital Expenditures 171,134 171,829 371,553
Identifiable Assets 2,901,661 2,754,830  
Corporate      
Segment Reporting Information [Line Items]      
Depreciation and Amortization 140 225 329
Operating Income (Loss) (16,342) (14,130) (13,123)
Interest Charges 685 1,902 1,740
Income Tax Expense (Benefit) (5,723) (4,689) (4,931)
Net Income (Loss) (12,114) (10,698) (9,557)
Capital Expenditures 66 68 63
Identifiable Assets 177,513 57,445  
Electric      
Segment Reporting Information [Line Items]      
Operating Revenue 549,699 480,321 446,088
Electric | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 549,699 480,321 446,088
Depreciation and Amortization 72,050 71,343 63,171
Operating Income (Loss) 113,138 106,964 107,083
Interest Charges 31,950 33,043 29,848
Income Tax Expense (Benefit) 5,065 1,663 12,480
Net Income (Loss) 79,974 72,458 66,778
Capital Expenditures 147,869 140,031 356,581
Identifiable Assets 2,351,961 2,283,776  
Manufacturing      
Segment Reporting Information [Line Items]      
Operating Revenue 397,983 336,294 238,770
Manufacturing | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 397,983 336,294 238,770
Depreciation and Amortization 16,202 15,436 14,933
Operating Income (Loss) 29,065 24,114 16,103
Interest Charges 2,796 2,239 2,215
Income Tax Expense (Benefit) 5,321 4,704 2,939
Net Income (Loss) 20,950 17,186 11,048
Capital Expenditures 17,954 20,690 10,587
Identifiable Assets 245,869 251,044  
Plastics      
Segment Reporting Information [Line Items]      
Operating Revenue 512,527 380,229 205,249
Plastics | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 512,527 380,229 205,249
Depreciation and Amortization 4,205 4,354 3,604
Operating Income (Loss) 264,578 132,760 37,823
Interest Charges 585 587 644
Income Tax Expense (Benefit) 68,688 34,374 9,718
Net Income (Loss) 195,374 97,823 27,582
Capital Expenditures 5,245 11,040 $ 4,322
Identifiable Assets $ 126,318 $ 162,565