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Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Total Operating Revenues $ 339,081 $ 374,904  
Net Income (Loss) 62,481 72,003  
Identifiable Assets 2,987,410   $ 2,901,661
Corporate      
Segment Reporting Information [Line Items]      
Net Income (Loss) (1,288) (2,160)  
Identifiable Assets 163,159   177,513
Electric | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 151,909 130,416  
Net Income (Loss) 23,221 19,233  
Identifiable Assets 2,418,544   2,351,961
Manufacturing | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 106,782 104,957  
Net Income (Loss) 6,862 4,084  
Identifiable Assets 256,451   245,869
Plastics | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 80,390 139,531  
Net Income (Loss) 33,686 $ 50,846  
Identifiable Assets $ 149,256   $ 126,318