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Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Total Operating Revenues $ 383,856 $ 316,294 $ 1,158,800 $ 863,612  
Net Income (Loss) 84,239 52,754 242,179 125,152  
Identifiable Assets 2,897,904   2,897,904   $ 2,754,830
Corporate          
Segment Reporting Information [Line Items]          
Net Income (Loss) (2,809) (2,384) (9,405) (5,787)  
Identifiable Assets 116,699   116,699   57,445
Electric | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 142,747 118,775 404,112 348,629  
Net Income (Loss) 24,847 22,528 62,938 55,547  
Identifiable Assets 2,347,461   2,347,461   2,283,776
Manufacturing | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 98,767 89,977 306,921 250,085  
Net Income (Loss) 6,219 4,200 17,858 15,290  
Identifiable Assets 253,819   253,819   251,044
Plastics | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 142,342 107,542 447,767 264,898  
Net Income (Loss) 55,982 $ 28,410 170,788 $ 60,102  
Identifiable Assets $ 179,925   $ 179,925   $ 162,565