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Revenue From Contracts With Customers (Disaggregation of Revenue, By Geography) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sales by Geography        
Total $ 318,441 $ 329,138 $ 864,094 $ 1,007,954
North America        
Sales by Geography        
Total 52,732 71,000 173,972 199,947
Germany        
Sales by Geography        
Total 16,163 17,204 51,208 59,487
Other including Eastern Europe/CIS        
Sales by Geography        
Total 54,907 62,196 158,686 192,527
China        
Sales by Geography        
Total 148,049 121,290 361,864 399,246
Japan        
Sales by Geography        
Total 12,884 21,859 41,241 54,879
Other        
Sales by Geography        
Total 31,227 28,877 70,924 89,544
Rest of World        
Sales by Geography        
Total $ 2,479 $ 6,712 $ 6,199 $ 12,324