SEGMENTS INFORMATION (Physical Location and Values of Long-Lived Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 105,805	$ 102,646
Belarus
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	50,065	50,085
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	14,028	13,101
Russia
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	11,191	9,902
Ukraine
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	9,435	8,433
India
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	6,863	7,019
Hungary
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	3,144	3,168
Poland
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,759	2,637
China
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	2,479	2,651
Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 5,841	$ 5,650