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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Net Components of Inventory    
Raw materials $ 329,609 $ 321,600
Work in process 263,545 210,174
Finished goods 199,876 221,532
Less: Excess and obsolete reserve (94,984) (86,078)
Inventories, net $ 698,046 $ 667,228