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Inventories (Schedule of Inventory, Current) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 149,645 $ 133,161
Work in process 10,434 10,243
Raw materials 14,757 12,164
Total inventory $ 174,836 $ 155,568