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Pensions and Other Postretirement Benefit Plans (Schedule of Plan Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, beginning of year $ 178,942 $ 205,586
Actual return on plan assets, net of expenses 32,367 (8,449)
Employer contributions 4,670 10,071
Plan participants' contributions 243 228
Benefits paid (8,404) (7,814)
Settlements (260) (13,029)
Foreign currency changes 4,197 (7,652)
Fair value of plan assets, end of year 211,755 178,942
Other postretirement benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets, beginning of year
Actual return on plan assets, net of expenses
Employer contributions 3,782 3,474
Plan participants' contributions 14
Benefits paid (3,782) (3,473)
Settlements
Foreign currency changes
Fair value of plan assets, end of year