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Pensions and Other Postretirement Benefit Plans (Schedule of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
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 | 178,942 | 205,586 | $ 180,672
Pension Plans [Member] | Total investments in the fair value hierarchy [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 84,713 | 87,358 |
Pension Plans [Member] | Quoted Prices in Active Markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,300 | 3,588 |
Pension Plans [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 78,523 | 81,363 |
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 | 284 | 335 |
Common Stocks and Equity Funds [Member] | Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 284 | 335 |
Investment of plan assets | 42,852 | 37,768 |
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 | 78,523 | 81,363 |
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 | 78,523 | 81,363 |
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 | 47,534 | 75,881 |
Insurance Contracts [Member] | Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,890 | 2,407 |
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 |  |  |
Cash and Short-Term Investments [Member] | Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,016 | 3,253 |
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 | 3,016 | 3,253 |
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 | $ 3,843 | $ 4,579 |

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