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Details of Selected Balance Sheet Accounts - Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Details of Selected Balance Sheet Accounts [Abstract]
Finished goods and purchased products	$ 90,558	$ 88,634
Work in process	33,852	27,063
Raw materials	93,779	95,410
Total inventories	218,189	211,107
Allowance for excess or obsolete inventory	(40,111)	(40,731)
Inventories, net	$ 178,078	$ 170,376

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Details of Selected Balance Sheet Accounts [Abstract]

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Amount before valuation and LIFO reserves of purchased products and 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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