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Pensions and Other Postretirement Benefits (Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | $ 16,420 | $ 14,501
Level 1 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 16,420 | 14,501
Level 2 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 0 | 0
Level 3 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 0 | 0
Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 7,796 | 7,221
Equity securities | Level 1 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 7,796 | 7,221
Equity securities | Level 2 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 0 | 0
Equity securities | Level 3 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 0 | 0
Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 6,975 | 5,309
Fixed income securities | Level 1 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 6,975 | 5,309
Fixed income securities | Level 2 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 0 | 0
Fixed income securities | Level 3 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 0 | 0
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 1,649 | 1,971
Cash and cash equivalents | Level 1 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 1,649 | 1,971
Cash and cash equivalents | Level 2 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | 0 | 0
Cash and cash equivalents | Level 3 Inputs |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit pension plan assets | $ 0 | $ 0

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