SEGMENTS INFORMATION (Physical Location and Values of Long-Lived Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 164,671	$ 165,259
Belarus
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	74,766	75,984
Ukraine
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	27,384	24,652
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	17,845	15,637
Russia
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	13,414	17,980
India
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	6,874	7,443
Poland
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	4,988	5,029
Hungary
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	4,887	5,201
China
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,806	3,036
Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 11,707	$ 10,297