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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Operating Revenue $ 338,033 $ 358,056 $ 1,027,437 $ 1,034,853  
Net Income 85,479 91,974 246,812 236,424  
Identifiable Assets 3,566,739   3,566,739   $ 3,242,568
Corporate          
Segment Reporting Information [Line Items]          
Net Income 296 801 1,226 488  
Identifiable Assets 404,648   404,648   293,215
Electric          
Segment Reporting Information [Line Items]          
Operating Revenue 130,380 130,326 384,696 395,997  
Electric | Operating Segments          
Segment Reporting Information [Line Items]          
Operating Revenue 130,380 130,326 384,696 395,997  
Net Income 28,530 24,565 69,486 67,420  
Identifiable Assets 2,692,929   2,692,929   2,533,831
Manufacturing          
Segment Reporting Information [Line Items]          
Operating Revenue 79,896 100,678 275,961 309,936  
Manufacturing | Operating Segments          
Segment Reporting Information [Line Items]          
Operating Revenue 79,896 100,678 275,961 309,936  
Net Income 2,174 7,446 14,271 20,276  
Identifiable Assets 249,947   249,947   251,343
Plastics          
Segment Reporting Information [Line Items]          
Operating Revenue 127,757 127,052 366,780 328,920  
Plastics | Operating Segments          
Segment Reporting Information [Line Items]          
Operating Revenue 127,757 127,052 366,780 328,920  
Net Income 54,479 $ 59,162 161,829 $ 148,240  
Identifiable Assets $ 219,215   $ 219,215   $ 164,179