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Details of Selected Balance Sheet Accounts - Inventories (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Details of Selected Balance Sheet Accounts [Abstract] |  |
Finished goods and purchased products | $ 91,215 | $ 87,934
Work in process | 30,706 | 24,722
Raw materials | 98,285 | 96,357
Total inventories | 220,206 | 209,013
Allowance for excess or obsolete inventory | (39,320) | (40,440)
Inventories, net | $ 180,886 | $ 168,573

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- Definition 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. + References No definition available. + Details
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