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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Net Components of Inventory    
Raw materials $ 322,707 $ 321,600
Work in process 233,795 210,174
Finished goods 204,604 221,532
Less: Excess and obsolete reserve (88,983) (86,078)
Inventories, net $ 672,123 $ 667,228