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Segment Information - Business Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Total Operating Revenues $ 261,710 $ 234,747  
Net Income (Loss) 30,329 24,268  
Identifiable Assets 2,618,540   $ 2,578,354
Corporate      
Segment Reporting Information [Line Items]      
Net Income (Loss) (1,790) (2,290)  
Identifiable Assets 55,889   54,183
Electric | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 123,699 119,870  
Net Income (Loss) 17,587 16,182  
Identifiable Assets 2,242,026   2,233,399
Manufacturing | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 75,825 68,479  
Net Income (Loss) 5,385 4,927  
Identifiable Assets 209,477   191,005
Plastics | Operating Segments      
Segment Reporting Information [Line Items]      
Total Operating Revenues 62,186 46,398  
Net Income (Loss) 9,147 $ 5,449  
Identifiable Assets $ 111,148   $ 99,767