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Regulatory and Rate Matters - Schedule of Change in Balance Sheet Related to Discontinued Services (Details) - USD ($) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Sep. 29, 2022 | Sep. 30, 2022 | Sep. 30, 2021
Current Assets: |  |  |
Inventory | $ (6,430) | $ 6,630 | $ 333
Utility Plant: |  |  |
Net utility plant | (382,798) |  |
Deferred Charges and Other Assets: |  |  |
Regulatory assets - ETA | 289,381 |  |
Regulatory Assets - Non-ETA | 22,593 |  |
Deferred Credits and Other Liabilities: |  |  |
Regulatory liabilities (3) | (77,254) |  |
Net increase (decrease) | $ 0 |  |
Undepreciated investments |  | 274,900 |
Investments, plant decommissioning |  | 14,500 |
Obsolete inventory |  | 6,400 |
Inventory, plant decommissioning |  | $ 16,200 |

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