Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Net Components of Inventory
Raw materials	$ 336,874	$ 328,080
Work in process	225,542	192,993
Finished goods	199,922	218,408
Less: Excess and obsolete reserve	(78,225)	(78,644)
Inventories, net	$ 684,113	$ 660,837

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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