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Revenue From Contracts With Customers (Disaggregation of Revenue, By Application) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sales by Application        
Total $ 318,441 $ 329,138 $ 864,094 $ 1,007,954
Materials processing        
Sales by Application        
Total 290,028 306,260 779,810 952,936
Other applications        
Sales by Application        
Total $ 28,413 $ 22,878 $ 84,284 $ 55,018