Summary of Significant Accounting Policies - Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Inventory, net
Raw materials	$ 105,638	$ 133,424
Work-in-progress	1,368	3,452
Finished goods	19,442	23,709
Total inventory	126,448	160,585
Inventory valuation reserves	$ 21,900	$ 23,500

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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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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