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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 159,613 $ 175,240
Work-in-process 112,534 100,494
Finished goods 276,991 279,937
Total 549,138 555,671
Long-term inventory 25,100 22,900
Inventories not yet available for sale $ 12,300 $ 16,800