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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | $ 35,296 | $ 42,835 | $ 191,652
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 3,535 | 3,277 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 30,414 | 38,220 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 1,347 | 1,338 |
Fixed income bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 29,896 | 27,704 |
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 | 29,896 | 27,704 |
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 | 3,535 | 3,277 |
Mutual funds | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension assets | 3,535 | 3,277 |
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 | 518 | 10,516 |
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 | 518 | 10,516 |
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 | 1,347 | 1,338 |
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 | $ 1,347 | $ 1,338 |

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