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Summary of Significant Accounting Policies (Schedule of Inventory, Current) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Summary of Significant Accounting Policies [Abstract]    
Raw materials $ 54,382 $ 47,588
Work-in-progress 4,710 5,806
Finished goods 20,186 20,077
Total inventories, net $ 79,278 $ 73,471