Inventories (Details) - USD ($) $ in Thousands	Apr. 03, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 83,078	$ 79,742
Work-in-process	60,761	60,042
Finished goods	26,459	27,472
Total	$ 170,298	$ 167,256

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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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