Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 294,896	$ 286,953	$ 275,015
Work-in-process	154,157	134,417	127,590
Finished goods	370,406	355,337	413,864
Other	15,217	12,793	12,620
Inventories, gross	834,676	789,500	829,089
Adjustment to value inventory at cost on the LIFO method	(156,495)	(156,495)	(125,883)
Inventories	$ 678,181	$ 633,005	$ 703,206

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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 by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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

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