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Pension Benefits and Other Postretirement Benefit Plans (Additional Information) (Details) $ in Thousands |  |  | 2 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 30, 2019 USD ($) | Oct. 18, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) plan | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Number of qualified noncontributory defined benefit plans | plan |  |  |  |  |  | 2 |  |
Pension assets |  |  |  |  |  | $ 20,236 |  | $ 19,273
Voluntary contributions |  |  |  |  |  | $ 16 | $ 25,347 |
Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Voluntary contributions |  |  |  |  | $ 25,000 |  | $ 25,000 |
Subsequent Event | Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Payment for settlement |  | $ 124,000 |  |  |  |  |  |
Lump sum distributions | $ 39,000 |  |  |  |  |  |  |
Forecast | Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Payment for settlement |  |  |  | $ 1,000 |  |  |  |
Minimum | Forecast | Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Settlement charge |  |  | $ 52,000 |  |  |  |  |
Pension assets |  |  | 7,000 | 7,000 |  |  |  |
Maximum | Forecast | Pension Benefits |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Settlement charge |  |  | 56,000 |  |  |  |  |
Pension assets |  |  | $ 11,000 | $ 11,000 |  |  |  |

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