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Summary of Significant Accounting Policies - Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Inventory, net    
Raw materials $ 133,424 $ 130,414
Work-in-progress 3,452 5,498
Finished goods 23,709 40,429
Total inventory 160,585 176,341
Inventory valuation reserves $ 23,500 $ 35,000