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Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Inventory, Net [Abstract] |  |  |
Raw materials | $ 321,600 | $ 328,080 |
Work in process | 210,174 | 192,993 |
Finished goods | 221,532 | 218,408 |
Less: Excess and obsolete reserve | (86,078) | (78,644) |
Inventories, net | 667,228 | 660,837 |
Inventory Write-down | $ 14,900 | $ 17,100 | $ 16,200

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