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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]      
Raw material $ 52,835   $ 42,661
Work-in-process 7,640   10,598
Finished goods 35,219   33,113
Total inventories $ 95,694 $ 81,637 $ 86,372