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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventories [Abstract]    
Raw materials $ 58,341 $ 47,588
Work-in-progress 5,395 5,806
Finished goods 23,019 20,077
Total inventories, net $ 86,755 $ 73,471