SEGMENT DATA Capital Expenditure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Capital expenditures	$ 24,583	$ 28,115	$ 26,736
BULGARIA
Segment Reporting Information [Line Items]
Capital expenditures	4,222	4,584	3,304
CZECH REPUBLIC
Segment Reporting Information [Line Items]
Capital expenditures	9,012	10,449	8,043
ROMANIA
Segment Reporting Information [Line Items]
Capital expenditures	4,767	6,639	6,863
Slovak Republic [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1,601	1,963	1,693
SLOVENIA
Segment Reporting Information [Line Items]
Capital expenditures	4,200	3,171	4,128
Total operating segments [Member]
Segment Reporting Information [Line Items]
Capital expenditures	23,802	26,806	24,031
Corporate [Member]
Segment Reporting Information [Line Items]
Capital expenditures	$ 781	$ 1,309	$ 2,705