SEGMENT INFORMATION (Geographical Information of Long-Lived Assets Based on Physical Location) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 73,616	$ 60,499
Belarus
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	46,011	44,879
Russia
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	7,203	2,084
Ukraine
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	5,610	4,487
Hungary
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	3,485	2,485
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,618	1,969
Poland
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,213	1,088
China
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	1,887	514
India
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	1,650	1,099
Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 2,939	$ 1,894