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Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Total Operating Revenues $ 337,716 $ 400,040 $ 676,797 $ 774,944  
Net Income (Loss) 81,969 85,937 144,450 157,940  
Identifiable Assets 3,093,986   3,093,986   $ 2,901,661
Corporate          
Segment Reporting Information [Line Items]          
Net Income (Loss) 974 (4,435) (313) (6,596)  
Identifiable Assets 210,173   210,173   177,513
Electric | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 113,763 130,949 265,671 261,365  
Net Income (Loss) 19,634 18,858 42,854 38,091  
Identifiable Assets 2,446,293   2,446,293   2,351,961
Manufacturing | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 102,475 103,196 209,257 208,154  
Net Income (Loss) 5,969 7,555 12,831 11,639  
Identifiable Assets 260,050   260,050   245,869
Plastics | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 121,478 165,895 201,869 305,425  
Net Income (Loss) 55,392 $ 63,959 89,078 $ 114,806  
Identifiable Assets $ 177,470   $ 177,470   $ 126,318