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Segment Information - Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]          
Total Operating Revenues $ 316,294 $ 235,755 $ 863,612 $ 663,258  
Net Income (Loss) 52,754 35,934 125,152 77,183  
Identifiable Assets 2,713,148   2,713,148   $ 2,578,354
Corporate          
Segment Reporting Information [Line Items]          
Net Income (Loss) (2,384) (2,457) (5,787) (6,440)  
Identifiable Assets 55,483   55,483   54,183
Electric | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 118,775 115,213 348,629 333,213  
Net Income (Loss) 22,528 24,737 55,547 54,225  
Identifiable Assets 2,271,636   2,271,636   2,233,399
Manufacturing | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 89,977 59,849 250,085 174,276  
Net Income (Loss) 4,200 3,311 15,290 8,476  
Identifiable Assets 242,414   242,414   191,005
Plastics | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 107,542 60,693 264,898 155,769  
Net Income (Loss) 28,410 $ 10,343 60,102 $ 20,922  
Identifiable Assets $ 143,615   $ 143,615   $ 99,767