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Inventories - Components (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]        
Raw materials $ 140,424 $ 124,480    
Work in process 3,003 3,049    
Finished goods 4,671 4,528    
Total, gross 148,098 132,057    
Less: Allowance for excess and obsolete inventories (2,007) (1,787) $ (2,304) $ (3,261)
Total, net $ 146,091 $ 130,270