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Inventories - Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]        
Raw materials $ 78,830 $ 76,238    
Work in process 2,577 2,088    
Finished goods 4,937 7,154    
Total, gross 86,344 85,480    
Less: Allowance for excess and obsolete inventories (2,304) (3,261) $ (2,365) $ (2,644)
Total, net $ 84,040 $ 82,219