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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