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Pension Benefits, Other Postretirement Benefits and Employee Savings and Investment Plans (Assets Carried at Fair Value by Level) (Details) - Pension Benefits - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | $ 26,300 | $ 33,462 | $ 35,296
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 2,466 | 3,400 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 22,711 | 28,772 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 1,123 | 1,290 |
Fixed income bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 22,180 | 28,392 |
Fixed income bonds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Fixed income bonds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 22,180 | 28,392 |
Fixed income bonds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Mutual funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 2,466 | 3,400 |
Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 2,466 | 3,400 |
Mutual funds | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Mutual funds | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Pooled separate accounts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 531 | 380 |
Pooled separate accounts | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Pooled separate accounts | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 531 | 380 |
Pooled separate accounts | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Guaranteed deposit account |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 1,123 | 1,290 |
Guaranteed deposit account | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Guaranteed deposit account | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 0 | 0 |
Guaranteed deposit account | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | $ 1,123 | $ 1,290 |

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