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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | $ 342,336 | $ 337,716 | $ 689,404 | $ 676,797 |
Net Income (Loss) | 86,995 | 81,969 | 161,333 | 144,450 |
Identifiable Assets | 3,460,783 |  | 3,460,783 |  | $ 3,242,568
Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Income (Loss) | 1,063 | 974 | 931 | (313) |
Identifiable Assets | 349,653 |  | 349,653 |  | 293,215
Electric |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 112,828 | 113,763 | 254,317 | 265,671 |
Electric | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 112,828 | 113,763 | 254,317 | 265,671 |
Net Income (Loss) | 18,485 | 19,634 | 40,956 | 42,854 |
Identifiable Assets | 2,634,116 |  | 2,634,116 |  | 2,533,831
Manufacturing |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 96,684 | 102,475 | 196,065 | 209,257 |
Manufacturing | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 96,684 | 102,475 | 196,065 | 209,257 |
Net Income (Loss) | 6,835 | 5,969 | 12,096 | 12,831 |
Identifiable Assets | 261,219 |  | 261,219 |  | 251,343
Plastics |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 132,824 | 121,478 | 239,022 | 201,869 |
Plastics | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenue | 132,824 | 121,478 | 239,022 | 201,869 |
Net Income (Loss) | 60,612 | $ 55,392 | 107,350 | $ 89,078 |
Identifiable Assets | $ 215,795 |  | $ 215,795 |  | $ 164,179

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