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Inventories, Net and Significant Supplier - Inventories, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]        
Raw materials $ 36,803 $ 33,059    
Components 18,556 15,046    
Work in process 6,596 5,860    
Finished goods 95,690 80,119    
Reserve for excess and obsolete inventory (3,125) (4,205) $ (3,658) $ (3,045)
Inventories, net $ 154,520 $ 129,879