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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Net Components of Inventory    
Raw materials $ 327,799 $ 321,600
Work in process 253,097 210,174
Finished goods 201,802 221,532
Less: Excess and obsolete reserve (92,553) (86,078)
Inventories, net $ 690,145 $ 667,228