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D. INVENTORIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 21,518 $ 22,240
Work in process and sub-assemblies 24,334 30,766
Finished goods 5,965 13,232
Inventories $ 51,817 $ 66,238