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Revenue From Contracts With Customers (Disaggregation of Revenue, By Application) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Sales by Application    
Total $ 345,585 $ 249,242
Materials processing    
Sales by Application    
Total 317,241 218,074
Other applications    
Sales by Application    
Total $ 28,344 $ 31,168