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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]        
Raw materials $ 36,152 $ 33,853    
Work in process 3,741 2,522    
Finished goods 3,480 2,881    
Inventory, gross 43,373 39,256    
Less: Allowance for excess and obsolete inventories (894) (757) $ (755) $ (714)
Total, net $ 42,479 $ 38,499