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Inventories, Net and Significant Suppliers - Inventories, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]        
Raw materials $ 69,991 $ 68,834    
Components 20,736 25,071    
Work in process 5,336 5,577    
Finished goods 60,265 50,006    
Reserve for excess and obsolete inventory (7,419) (5,138) $ (7,537) $ (4,288)
Inventories, net $ 148,909 $ 144,350