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Property, Plant And Equipment (Long-Lived Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Long-lived assets $ 553,732 $ 473,854
United States    
Property, Plant and Equipment [Line Items]    
Long-lived assets 346,343 273,947
Russia    
Property, Plant and Equipment [Line Items]    
Long-lived assets 76,359 87,612
Germany    
Property, Plant and Equipment [Line Items]    
Long-lived assets 81,218 83,826
China    
Property, Plant and Equipment [Line Items]    
Long-lived assets 9,123 8,191
Other    
Property, Plant and Equipment [Line Items]    
Long-lived assets $ 40,689 $ 20,278