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Inventories (Schedule of Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]      
Raw material $ 57,845   $ 42,661
Work-in-process 6,930   10,598
Finished goods 34,138   33,113
Total inventories $ 98,913 $ 81,637 $ 86,372