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Inventories (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 42,011 $ 42,215
Work in process 45,621 65,448
Finished goods 12,133 28,856
Total inventories 99,765 $ 136,519
Decrease in inventories of adoption of ASC 606 $ 47,100