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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Net Components of Inventory    
Raw materials $ 345,419 $ 328,080
Work in process 246,902 192,993
Finished goods 207,239 218,408
Less: Excess and obsolete reserve (85,071) (78,644)
Inventories, net $ 714,489 $ 660,837