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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 114,884 $ 124,171
Work-in-process 73,149 65,392
Finished goods 142,507 138,302
Total 330,540 327,865
Long-term inventory 34,300 29,000
Inventories not yet available for sale $ 25,900 $ 17,600