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Summary of Significant Accounting Policies (Schedule of Inventory, Current) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract]    
Raw materials $ 47,588 $ 35,665
Work-in-progress 5,806 7,483
Finished goods 20,077 16,969
Total inventories, net $ 73,471 $ 60,117