SEGMENTS INFORMATION (Physical Location and Values of Long-Lived Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 111,175	$ 102,646
Belarus
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	48,984	50,085
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	13,799	13,101
Russia
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	12,563	9,902
Ukraine
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	12,535	8,433
India
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	6,755	7,019
Hungary
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	3,345	3,168
China
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,904	2,651
Poland
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,876	2,637
Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 7,414	$ 5,650