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INVENTORIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
INVENTORIES    
Parts and raw materials $ 23,136 $ 23,978
Work-in-process 7,104 6,628
Finished goods 5,268 4,928
Inventory, gross 35,508 35,534
Less reserves (4,646) (4,436)
Inventories $ 30,862 $ 31,098