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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

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Sales By Application [Abstract]

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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