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Pension and Other Postretirement Benefit Plans - Assets that are Carried at Fair Value, and the Method Used to Determine Fair Value (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Long Corporate Bond Fund [Member] |  |  |
Pooled Separate Accounts |  |  |
Average duration of bonds | 3 months |  |
Retirement Plan [Member] |  |  |
Pooled Separate Accounts |  |  |
Plan Investments | $ 19,065 | $ 26,059 | $ 27,720
Retirement Plan [Member] | Long Duration Bond Fund [Member] |  |  |
Pooled Separate Accounts |  |  |
Plan Investments | 4,596 | 11,700 |
Retirement Plan [Member] | Long Corporate Bond Fund [Member] |  |  |
Pooled Separate Accounts |  |  |
Plan Investments | 3,754 | 5,157 |
Retirement Plan [Member] | Prudential Short-term [Member] |  |  |
Pooled Separate Accounts |  |  |
Plan Investments | 262 | 150 |
Retirement Plan [Member] | Investment Grade Bond Fund [Member] |  |  |
Pooled Separate Accounts |  |  |
Plan Investments | $ 10,453 | $ 9,052 |

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