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Inventories, Net and Significant Suppliers - Inventories, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]          
Raw materials $ 68,834   $ 43,638    
Components 25,071   16,214    
Work in process 5,577   1,847    
Finished goods 50,006   105,178    
Reserve for excess and obsolete inventory (5,138)   (4,288) $ (4,205) $ (3,045)
Inventories, net $ 144,350 $ 138,759 $ 162,589