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Pension Plans and Other Postretirement Benefit Plans - Schedule of Fair Value Hierarchy of Other Postretirement Plan Assets (Details) - Other Postretirement Benefits [Member] - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 59,544 | $ 52,173 | $ 44,853
Mutual Fund [Member] | Balanced Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | 59,545 | 52,173 |
Level 1 [Member] | Mutual Fund [Member] | Balanced Fund [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [1] | $ 59,545 | $ 52,173 |
[1] | The balanced index fund for 2021 and 2020 is a single mutual fund that includes a percentage of U.S. equity and fixed income securities and International equity and fixed income securities.

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