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INVENTORIES - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 102,030 $ 99,495
Work-in-process 90,301 98,753
Finished goods 146,125 154,012
Total 338,456 352,260
Long-term inventory 7,200 13,200
Inventories not yet available for sale $ 12,500 $ 37,500