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Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 42,411 $ 42,215
Work in process 44,184 65,448
Finished goods 13,439 28,856
Total inventories 100,034 $ 136,519
Decrease in inventories of adoption of ASC 606 $ 47,100