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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, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets, beginning of year | $ 2,407 | $ 2,238
Net realized gains |  |
Net unrealized gains | (45) | 56
Net purchases, issuances and settlements | 528 | 113
Net transfers (out of) Level 3 |  |
Fair value of plan assets, end of year | $ 2,890 | $ 2,407

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