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Pensions and Other Postretirement Benefit Plans (Reconciliation of Level 3 Assets) (Details) - Insurance Contracts [Member] - United States [Member] - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, beginning of year | $ 2,890 | $ 2,407
Net realized gains |  |
Net unrealized gains | 20 | (45)
Net purchases, issuances and settlements | 334 | 528
Net transfers (out of) Level 3 |  |
Fair value of plan assets, end of year | $ 3,244 | $ 2,890

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