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Inventories (Components) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]            
Raw materials $ 62,272   $ 57,784      
Work in process 3,414   5,957      
Finished goods 6,188   8,163      
Inventory, gross 71,874   71,904      
Less: Allowance for excess and obsolete inventories (1,407) $ (1,209) (1,118) $ (1,642) $ (1,442) $ (1,382)
Total, net $ 70,467   $ 70,786