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Income Taxes Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |
Deferred tax liabilities, period increase (decrease) |  | $ (6,144) |  |
Unrecognized tax benefits before impact of deductions for state taxes, excluding interest and penalties | $ 1,411 | 1,411 | $ 1,359 |
Unrecognized tax benefits that would impact effective tax rate | 70 | 70 | 46 |
Accrued interest expense net of the benefit of tax deductions | 70 | 70 |  |
Cumulative reduction in unrecognized tax benefits, due to lapsing of statutes of limitations |  | 24 |  |
Other | 968 | 968 | 1,041 |
Provision for income taxes |  | 10,065 | 35,393 | $ 33,542
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense |  |  | 2,357 |
Tax Cuts And Jobs Act of 2017, Measurement Period Adjustment, Income Tax Expense (Benefit) | 67 |  |  |
Tax Cuts And Jobs Act Of 2017, Measurement Period Adjustment, Increase (Decrease) Of Regulatory Liability | 455 |  |  |
Deferred Income Tax Charge |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Deferred tax liabilities, period increase (decrease) |  | 3,342 |  |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense |  |  | 83,666 |
2017 Federal and State Repairs and Maintenance Deduction [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax credits and adjustments |  | 12,873 |  |
2017 Federal and State Repairs and Maintenance Deduction [Member] | Domestic Tax Authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Other | $ 2,703 | 2,703 |  |
2017 Federal and State Repairs and Maintenance Deduction [Member] | State and Local Jurisdiction |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Provision for income taxes |  | $ (899) |  |
2016 Federal and State Repairs and Maintenance Deduction [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax credits and adjustments |  |  | 20,168 |
2016 Federal and State Repairs and Maintenance Deduction [Member] | Domestic Tax Authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Other |  |  | 7,059 |
2016 Federal and State Repairs and Maintenance Deduction [Member] | State and Local Jurisdiction |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Provision for income taxes |  |  | $ (1,159) |

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