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Pensions and Other Postretirement Benefit Plans (Schedule of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Pension plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 225,327 | $ 239,051 | $ 211,755
Pension plans | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 225,329 | 239,051 |
Pension plans | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 724 | 1,095 |
Pension plans | Fair Value, Inputs, Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 98,252 | 104,642 |
Pension plans | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,861 | 3,819 |
Pension plans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 102,837 | 109,556 |
Other postretirement benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 | 0
Common Stocks and equity funds | Pension plans | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Common Stocks and equity funds | Pension plans | Fair Value, Inputs, Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Common Stocks and equity funds | Pension plans | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Common Stocks and equity funds | Pension plans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Common Stocks and equity funds | Pension plans | Fair Value Measured at Net Asset Value Per Share | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 18,963 | 20,213 |
Debt securities | Pension plans | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Debt securities | Pension plans | Fair Value, Inputs, Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 98,252 | 104,642 |
Debt securities | Pension plans | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Debt securities | Pension plans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 98,252 | 104,642 |
Insurance contracts | Pension plans | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Insurance contracts | Pension plans | Fair Value, Inputs, Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Insurance contracts | Pension plans | Fair Value, Inputs, Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,861 | 3,819 | $ 3,244
Insurance contracts | Pension plans | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,861 | 3,819 |
Insurance contracts | Pension plans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,861 | 3,819 |
Cash and short-term investments | Pension plans | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 724 | 1,095 |
Cash and short-term investments | Pension plans | Fair Value, Inputs, Level 2 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Cash and short-term investments | Pension plans | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Cash and short-term investments | Pension plans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 724 | 1,095 |
Fixed income funds | Pension plans | Fair Value Measured at Net Asset Value Per Share | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 101,845 | 107,012 |
Limited partnerships | Pension plans | Fair Value Measured at Net Asset Value Per Share | Fair Value, Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 1,684 | $ 2,270 |

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