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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]            
Raw materials $ 39,713   $ 33,853      
Work in process 2,169   2,522      
Finished goods 2,696   2,881      
Inventory, gross 44,578   39,256      
Less: Allowance for excess and obsolete inventories (1,177) $ (1,065) (757) $ (603) $ (773) $ (714)
Total, net $ 43,401   $ 38,499