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Inventories - Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]        
Raw materials $ 67,815 $ 68,842    
Work in process 2,055 1,825    
Finished goods 5,350 5,578    
Total, gross 75,220 76,245    
Less: Allowance for excess and obsolete inventories (2,365) (2,644) $ (1,567) $ (1,210)
Total, net $ 72,855 $ 73,601