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Inventories, Net and Significant Suppliers - Inventories, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]        
Raw materials $ 71,784 $ 68,834    
Components 16,759 25,071    
Work in process 8,858 5,577    
Finished goods 58,053 50,006    
Reserve for excess and obsolete inventory (5,488) (5,138) $ (4,228) $ (4,288)
Inventories, net $ 149,966 $ 144,350