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Inventories, net (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Inventories, net
Raw materials	$ 92,208	$ 95,867
Work in process	35,550	32,131
Finished goods (completed systems)	21,420	12,366
Inventories, net	$ 149,178	$ 140,364

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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