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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 115,436 $ 124,171
Work-in-process 67,983 65,392
Finished goods 141,543 138,302
Total 324,962 327,865
Long-term inventory 31,100 29,000
Inventories not yet available for sale $ 23,300 $ 17,600