Inventories - Major Classes of Inventories (Details) - USD ($) $ in Thousands	Mar. 29, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 113,310	$ 98,530
Work-in-process	34,898	34,717
Finished goods	126,826	119,331
Gross inventories	275,034	252,578
Excess and obsolete reserves	(22,113)	(21,245)
Net inventories	$ 252,921	$ 231,333

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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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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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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 of valuation reserve for inventory.

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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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