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Pensions and Other Postretirement Benefit Plans (Schedule of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Other postretirement benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  |  |
Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 211,755 | 178,942 | $ 205,586
Pension Plans [Member] | Total investments in the fair value hierarchy [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 98,974 | 84,713 |
Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,009 | 3,300 |
Pension Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 92,721 | 78,523 |
Pension Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,244 | 2,890 |
Common Stocks and Equity Funds [Member] | Other postretirement benefits [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 216 | 284 |
Common Stocks and Equity Funds [Member] | Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 216 | 284 |
Investment of plan assets | 56,846 | 42,852 |
Common Stocks and Equity Funds [Member] | Pension Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  |  |
Common Stocks and Equity Funds [Member] | Pension Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  |  |
Debt Securities [Member] | Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 92,721 | 78,523 |
Debt Securities [Member] | Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  |  |
Debt Securities [Member] | Pension Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 92,721 | 78,523 |
Debt Securities [Member] | Pension Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  |  |
Fixed income funds [Member] | Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment of plan assets | 52,751 | 47,534 |
Insurance Contracts [Member] | Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,244 | 2,890 |
Insurance Contracts [Member] | Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  |  |
Insurance Contracts [Member] | Pension Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  |  |
Insurance Contracts [Member] | Pension Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,244 | 2,890 |
Cash and Short-Term Investments [Member] | Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,793 | 3,016 |
Cash and Short-Term Investments [Member] | Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,793 | 3,016 |
Cash and Short-Term Investments [Member] | Pension Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  |  |
Cash and Short-Term Investments [Member] | Pension Plans [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  |  |
Limited Partnerships [Member] | Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment of plan assets | 3,184 | 3,843 |
Hedge Funds [Member] | Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investment of plan assets | $ 211,755 | $ 178,942 |

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