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Pensions and Other Postretirement Benefit Plans (Schedule of Amounts That Will Be Amortized from Accumulated Other Comprehensive Income) (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Pension Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Actuarial loss | $ 2,409
Prior service cost/(benefit) | 32
Total | 2,441
Other postretirement benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Actuarial loss | 2,592
Prior service cost/(benefit) | (4,488)
Total | $ (1,896)

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