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Income Taxes Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |
Document Period End Date |  | Dec. 31, 2019 |  |
Deferred tax liabilities, period increase (decrease) |  | $ 115,947 |  |
Unrecognized tax benefits before impact of deductions for state taxes, excluding interest and penalties | $ 4,037 | 4,037 | $ 1,411 |
Unrecognized tax benefits that would impact effective tax rate | 27 | 27 | 70 |
Accrued interest expense net of the benefit of tax deductions | 27 | 27 |  |
Cumulative reduction in unrecognized tax benefits, due to lapsing of statutes of limitations |  | 43 |  |
Other | 4,148 | 4,148 | 1,138 |
Provision for income taxes |  | 8,454 | 10,065 | $ 35,393
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense |  |  | 2,357 |
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit) | 67 |  |  |
Tax Cuts And Jobs Act Of 2017, Measurement Period Adjustment, Increase (Decrease) Of Regulatory Liability | 455 |  |  |
Liability recorded in tax memorandum account |  |  | 6,504 |
Deferred Income Tax Charge |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Deferred tax liabilities, period increase (decrease) |  | 109,435 |  |
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense |  |  | $ 83,666 |
Federal |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating Loss Carryforwards | 9,213 | 9,213 |  |
Connecticut |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating Loss Carryforwards | 32,604 | 32,604 |  |
Tax Credit Carryforward, Amount | 1,000 | 1,000 |  |
Maine |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating Loss Carryforwards | $ 9,506 | $ 9,506 |  |

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