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Inventories (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 39,822 $ 42,215
Work in process 44,526 65,448
Finished goods 13,311 28,856
Total inventories 97,659 $ 136,519
Decrease in inventories of adoption of ASC 606 $ 47,100