INVENTORIES (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
INVENTORIES
Parts and raw materials	$ 21,790	$ 21,573
Work-in-process	2,741	2,924
Finished goods	3,646	4,403
Inventory, gross	28,177	28,900
Less reserves	(3,664)	(3,529)
Inventories, net	$ 24,513	$ 25,371