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Pensions and Other Postretirement Benefit Plans (Schedule of Net Periodic Benefit Plan Cost) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components of net periodic benefit cost:      
Curtailment (gain)/loss $ (500) $ (700)  
United States [Member]      
Weighted average assumptions used to determine net cost:      
Discount rate 4.41% 3.70% 4.20%
Expected return on plan assets 4.57% 3.87% 4.40%
Rate of compensation increase
Non-U.S. Pension Plans [Member]      
Weighted average assumptions used to determine net cost:      
Discount rate 2.98% 2.83% 2.98%
Expected return on plan assets 4.45% 4.83% 4.46%
Rate of compensation increase 3.02% 3.04% 3.29%
United States Postretirement Benefits Plan [Member]      
Weighted average assumptions used to determine net cost:      
Discount rate 4.31% 3.59% 4.00%
Expected return on plan assets
Rate of compensation increase 3.00%
Non-U.S. Postretirement Benefits Plan [Member]      
Weighted average assumptions used to determine net cost:      
Discount rate 3.65% 3.40% 3.70%
Expected return on plan assets
Rate of compensation increase 3.00% 3.00% 3.00%
Pension Plans [Member]      
Components of net periodic benefit cost:      
Service cost $ 2,543 $ 2,723 $ 2,720
Interest cost 7,216 7,217 7,476
Expected return on assets (8,285) (8,873) (8,152)
Amortization of prior service cost/(credit) 68 34 36
Amortization of net actuarial loss 2,253 2,219 2,628
Settlement (16) 2,246
Curtailment (gain)/loss 466 (752)
Net periodic benefit cost 4,245 4,814 4,708
Other postretirement benefits [Member]      
Components of net periodic benefit cost:      
Service cost 189 232 244
Interest cost 2,114 2,024 2,214
Expected return on assets
Amortization of prior service cost/(credit) (4,488) (4,488) (4,488)
Amortization of net actuarial loss 2,227 2,956 2,811
Settlement
Curtailment (gain)/loss
Net periodic benefit cost $ 42 $ 724 $ 781