SEGMENT INFORMATION (Physical Locations and Values of Long-Lived Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 236,214	$ 169,533	$ 165,259
Ukraine
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	78,289	30,980	24,652
Belarus
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	75,422	73,988	75,984
Russia
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	16,611	15,036	17,980
United States
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	14,843	15,718	15,637
India
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	9,459	7,079	7,443
Poland
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	8,240	5,434	5,029
Hungary
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	5,339	5,365	5,201
Other
Long-Lived Assets by Geographical Areas [Line Items]
Long-lived assets	$ 28,011	$ 15,933	$ 13,333