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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 123,819 $ 122,825
Work-in-process 70,377 70,458
Finished goods 141,694 128,896
Total 335,890 322,179
Long-term inventory 22,900 8,100
Inventories not yet available for sale $ 11,200 $ 12,500