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Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Operating Revenue $ 347,068 $ 339,081  
Net Income (Loss) 74,338 62,481  
Identifiable Assets 3,326,032   $ 3,242,568
Corporate      
Segment Reporting Information [Line Items]      
Net Income (Loss) (133) (1,288)  
Identifiable Assets 286,088   293,215
Electric      
Segment Reporting Information [Line Items]      
Operating Revenue 141,488 151,909  
Electric | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 141,488 151,909  
Net Income (Loss) 22,470 23,221  
Identifiable Assets 2,586,318   2,533,831
Manufacturing      
Segment Reporting Information [Line Items]      
Operating Revenue 99,380 106,782  
Manufacturing | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 99,380 106,782  
Net Income (Loss) 5,261 6,862  
Identifiable Assets 263,408   251,343
Plastics      
Segment Reporting Information [Line Items]      
Operating Revenue 106,200 80,390  
Plastics | Operating Segments      
Segment Reporting Information [Line Items]      
Operating Revenue 106,200 80,390  
Net Income (Loss) 46,740 $ 33,686  
Identifiable Assets $ 190,218   $ 164,179