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Segment Information - Summary of Business Segments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Operating Revenue $ 1,349,166 $ 1,460,209 $ 1,196,844
Depreciation and Amortization 97,954 92,597 91,358
Operating Income (Loss) 377,919 390,439 249,708
Interest Expense 37,677 36,016 37,771
Income Tax Expense (Benefit) 69,298 73,351 36,052
Net Income (Loss) 294,191 284,184 176,769
Capital Expenditures 287,134 171,134 171,829
Identifiable Assets 3,242,568 2,901,661  
Corporate      
Segment Reporting Information [Line Items]      
Depreciation and Amortization 102 140 225
Operating Income (Loss) (12,144) (16,342) (14,130)
Interest Expense 916 685 1,902
Income Tax Expense (Benefit) (3,806) (5,723) (4,689)
Net Income (Loss) 565 (12,114) (10,698)
Capital Expenditures 126 66 68
Identifiable Assets 293,215 177,513  
Electric      
Segment Reporting Information [Line Items]      
Operating Revenue 528,359 549,699 480,321
Electric | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 528,359 549,699 480,321
Depreciation and Amortization 75,330 72,050 71,343
Operating Income (Loss) 106,521 113,138 106,964
Interest Expense 33,864 31,950 33,043
Income Tax Expense (Benefit) 1,648 5,065 1,663
Net Income (Loss) 84,424 79,974 72,458
Capital Expenditures 240,695 147,869 140,031
Identifiable Assets 2,533,831 2,351,961  
Manufacturing      
Segment Reporting Information [Line Items]      
Operating Revenue 402,781 397,983 336,294
Manufacturing | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 402,781 397,983 336,294
Depreciation and Amortization 18,495 16,202 15,436
Operating Income (Loss) 29,140 29,065 24,114
Interest Expense 2,295 2,796 2,239
Income Tax Expense (Benefit) 5,390 5,321 4,704
Net Income (Loss) 21,454 20,950 17,186
Capital Expenditures 23,284 17,954 20,690
Identifiable Assets 251,343 245,869  
Plastics      
Segment Reporting Information [Line Items]      
Operating Revenue 418,026 512,527 380,229
Plastics | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 418,026 512,527 380,229
Depreciation and Amortization 4,027 4,205 4,354
Operating Income (Loss) 254,402 264,578 132,760
Interest Expense 602 585 587
Income Tax Expense (Benefit) 66,066 68,688 34,374
Net Income (Loss) 187,748 195,374 97,823
Capital Expenditures 23,029 5,245 $ 11,040
Identifiable Assets $ 164,179 $ 126,318