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Segment Information - Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Segment Reporting Information [Line Items]          
Total Operating Revenues $ 400,040 $ 285,608 $ 774,944 $ 547,318  
Net Income (Loss) 85,937 42,069 157,940 72,398  
Identifiable Assets 2,875,500   2,875,500   $ 2,754,830
Corporate          
Segment Reporting Information [Line Items]          
Net Income (Loss) (4,435) (1,613) (6,596) (3,402)  
Identifiable Assets 97,481   97,481   57,445
Electric | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 130,949 106,155 261,365 229,855  
Net Income (Loss) 18,858 15,433 38,091 33,019  
Identifiable Assets 2,309,245   2,309,245   2,283,776
Manufacturing | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 103,196 84,284 208,154 160,107  
Net Income (Loss) 7,555 5,705 11,639 11,089  
Identifiable Assets 267,050   267,050   251,044
Plastics | Operating Segments          
Segment Reporting Information [Line Items]          
Total Operating Revenues 165,895 95,169 305,425 157,356  
Net Income (Loss) 63,959 $ 22,544 114,806 $ 31,692  
Identifiable Assets $ 201,724   $ 201,724   $ 162,565