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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 123,608 $ 122,825
Work-in-process 68,880 70,458
Finished goods 146,025 128,896
Total 338,513 322,179
Long-term inventory 23,700 8,100
Inventories not yet available for sale $ 18,200 $ 12,500