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INCOME TAXES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 22, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2024 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | May 31, 2019
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment tax credit, solar property, percentage |  |  |  |  |  |  |  |  |  | 30.00% | 30.00%
Deferred employer portion of OASDI |  |  |  | $ 3,100 |  |  |  |  |  |  |
Deferred tax assets, operating loss carryforwards, domestic, refundable and receivables |  |  |  | 22,800 | $ 22,800 |  |  |  |  |  |
Federal net operating losses |  |  |  | 24,091 | 24,173 |  |  |  |  |  |
Tax credit carryforward |  |  |  | $ 195,200 | 154,200 |  |  |  |  |  |
Net operating losses, life |  |  |  | 20 years |  |  |  |  |  |  |
Valuation allowance |  |  |  | $ 17,600 | $ 4,000 |  |  |  |  |  |
Federal statutory rate |  | 21.00% | 35.00% | 21.00% | 21.00% | 24.50% |  |  |  |  |
Tax cuts and jobs act, income tax expense (benefit) |  |  |  |  | $ (59,600) |  |  |  |  |  |
Change in tax rate, deferred tax liability, provisional income tax (expense) benefit |  |  |  |  |  | $ 228,400 |  |  |  |  |
Change in tax rate, deferred income taxes |  |  |  |  |  | 164,300 |  |  |  |  |
Change in tax rate, provisional income tax expense (benefit) |  |  |  |  |  | 64,100 |  |  |  |  |
Initial revaluation of excess deferred income taxes | $ 20,100 |  |  |  |  |  |  |  |  |  |
Overcollection of taxes | 9,000 |  |  |  |  |  |  |  |  |  |
Deferred income tax expense (benefit), remeasurement |  |  |  |  |  | 14,300 |  |  |  |  |
Amortization of excess deferred income taxes |  |  |  |  |  | 1,800 |  |  |  |  |
Revaluation of deferred income taxes not included in base rates |  |  |  |  |  | 880 |  |  |  |  |
Regulatory liability, excess deferred income taxes |  |  |  | $ 195,000 |  |  |  |  |  |  |
March 2018 BGSS/CIP Filing |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Approved customer refunds | $ 31,000 |  |  |  |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment tax credit, solar property, percentage |  |  |  |  |  |  | 10.00% | 22.00% | 26.00% |  |
Clean Energy Ventures |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Federal net operating losses |  |  |  | 24,100 |  |  |  |  |  |  |
Natural Gas Distribution |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward |  |  |  | 898 | 2,000 |  |  |  |  |  |
Income tax expense (benefit) provision |  |  |  |  |  | $ 17,000 |  |  |  |  |
Domestic Tax Authority |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating losses |  |  |  | 134,000 | 134,000 |  |  |  |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating losses |  |  |  | $ 487,700 | $ 340,000 |  |  |  |  |  |
State and Local Jurisdiction | Minimum |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating losses, life |  |  |  | 7 years |  |  |  |  |  |  |
State and Local Jurisdiction | Maximum |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net operating losses, life |  |  |  | 20 years |  |  |  |  |  |  |

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